X-Word Vocabulary Definitions
| xanthan gum. | Produced by culture fermentation of glucose. Used as stabilizer. |
| xanthine. | Yellowish-red purine base. |
| xanthrocroid. | Having a light complexion and light hair. (Scandinavian) |
| xanthoma. | Nodular yellowish-orange patches, esp. on eyelids. |
| xanthophyll. | Yellow caretenoid pigment found with chlorophyll in green plants and in egg yolks. |
| xanthous. | Having light brown or yellowish skin. |
| xebec. | Small, three-masted Mediterranean vessel with both square and triangular sails. |
| xenia. | Effect on a hybrid strain produced by transferring pollen from one strain to the seed of another strain. |
| xenoblast. | A mineral deposit that has developed during metamorphosis without developing crystal faces. |
| xenogamy. | Cross-pollination. |
| xenocyst. | Crystal foreign to the igneous rock in which it occurs. |
| xenogenesis. | The supposed production of offspring markedly different from and showing no relationship to either of its parents. |
| xenolith. | A rock fragment foreign to the igneous mass in which it occurs. |
| xeroderma. | Abnormal dryness of the skin. |
| xerophilous. | Flourishing in a hot, dry environment. |
| xerophthalmia. | Extreme dryness of the conjunctive, thought to stem from a vitamin A deficiency. |
| xerosere. | A sequence of ecological communities beginning in a dry area. |
| xerosis. | 1. Abnormal dryness of the skin, conjunctiva, or mucous membranes; 2. The normal evolutionary sclerosis of aging tissue. |
| Xhosa. | South African Bantus |
| xiphisternum. | The posterior and smallest of the three divisions of the sternum. |
| xiphoid. | 1. Sword-shaped. 2.. Shaped like the xiphisternum. |
| xiphosuran. | Horseshoe crab and extinct forms. |
| Xuthus. | The ancestor of the Ionian Greeks. |
| xylan. | Yellow, gummy pentosan found plant cell walls. |
| xylem. | Woody tissue, supporting and water-conducting tissue in vascular plants. |
| xyloid. | Solvent. Any of three flammable hydrocarbons obtained from wood and coal tar. |
| xylophagous. | Feeding on wood. |
| xylose. | Sugar used in dyeing, tanning, and diabetic diets. |
| xyster. | Bone-scraping surgical instrument. |
Y-Word Vocabulary Definitions
| yahoo. | Crude or brutish person (from Gulliver's Travels). |
| Yahwist. | The author of the earliest sources of the Hexatuech in which God is called Yahweh. |
| yakitori. | Bite-sized marinated chicken on small skewers. |
| yamen. | Office or home of Chinese official (Empire days). |
| yang. | Active masculine principle |
| .yapok. | Aquatic S. A. marsupial aquatic mammal. hind feet, dense fur, long tail. |
| Yaqui. | Now living in Sonora. |
| yard arm. | Either end of a yard of square sail. |
| yard of ale. | Slender horn-shaped glass that is three feet tall and holds three pints. |
| yare. | 1. Responding easily, maneuverable. 2. Bright, lively. 3. Prepared. |
| yarrow. | Flower. |
| yashmak. | Veil worn by Moslem women. |
| yataghan. | Double-curved blade, eared pommel, no handle guard. Turkish. |
| yaupon. | Holly, Medicinal. |
| yawl. | 1. Two-masted fore-and-aft rigged. Like ketch but smaller jigger mast stepped abaft the rudder. 2. A ship's small boat manned by oarsmen. |
| yaws. | An infectious tropical skin disease caused by a spirochete. |
| yeanling. | A lamb or kid. |
| yegg. | A thief. |
| yellow-bark. | Calisaya. |
| yellow-dog contract. | Contract requiring worker to eschew union membership (illegal). |
| yellow flu. | organized student absence to protest busing. |
| yellowhammer. | Woodpecker. |
| yellow jack. | 1. Yellow fever. 2. Yellow flag hoisted to request pratique (ship clearance after quarantine) or to warn of contagion. 3. food fish. |
| yellow-legs. | N. A. wading birds. |
| yellow-shafted flicker. | Yellow-hammer. |
| yellow-tail. | Marine game fish. |
| yellow-throat. | Birds. |
| yenta. | A gossipy woman, esp. one who pries. |
| yerba maté. | The maté. |
| Yerkish. | Geometric language for communicating with primates. |
| yeshivah. | Study of the Talmud. 2. Grammar, high school where Jewish religion and culture is added to the three R's. |
| yé-yé. | French rock. |
| YHWH. | Hebrew Tetragammon representing the name of God. |
| Yiddish | High German with many words borrowed from Hebrew and Slavic. Written in Hebrew characters. Spoken as vernacular in Eastern European Jewish communities and spoken by emigrees around the world. |
| ylang-ylang. | Asian perfume tree. |
| yogh. | The Middle English letter representing velar or partial fricative sound of w between vowels. |
| yohimbine. | Aphrodisiac, local anesthetic, and mydriatic (Kickapoo Joy Juice?). |
| yoicks. | Hunting cry to urge the hounds after the fox. |
| yokozuna. | A champion sumo wrestler. |
| yonim | Vulva in Indian and Tibetan religion. |
| Yorkshire pudding. | Milk, flour, eggs, cooked in drippings of roast beef. |
| younker. | 1. A young man. 2. A child. |
| Yquem. | A sauterne wine. |
| yuan. | Chinese money. |
| Yuga. | Hindu: One of the four ages constituting the cycle of history. |
| yulan. | A white-flowering tree. |
Z-Word Vocabulary Definitions
| zabaglione. | Egg yolks, sugar, and wine beaten until think and served hot or cold. |
| zaffer. | Impure cobalt oxide used to produce blue enamel and to make smalt (deep blue paint and pigment made by pulverizing glass, cobalt oxide, and. ). |
| zaffig. | 1. Full-bosomed. 2. Ample figure (Yiddish). |
| Zagreus. | Son of Zeus and Persephone who was slain by the Titans and returned as Dionysius. |
| zaibatsu. | A powerful, family-controlled Japanese combine. |
| zaikal. | The commercial and financial community of Japan. |
| zaire. | Zaire currency. |
| zamia. | Cycads having thick, mostly underground trunk and palmy leaves. |
| zamindar. | 1. An official in pre-colonial India assigned to collect land taxes for his district. 2. A native landholder in British colonial India responsible for collecting and paying to the government taxes on the land under his jurisdiction. |
| Zapata mustache. | Curves down at the ends. |
| zapatedeo. | 1. Heel-stamping in Spanish flamenco. 2. Heel-stamping flamenco. |
| Zapotec. | Languages in southern Mexico. |
| zareba. | 1. An enclosure of bushes or stakes protecting a campsite in N. W. Africa.2. A campsite or village so protected. |
| zarf. | A chalice-like holder for hot coffee, typically made of ornamented metal (middle East). |
| zax. | Hatchet-like tool for cutting and dressing roofing slates. |
| zazen. | Zen meditation. |
| zebu. | domesticated humped Asiatic bovine with large dewlap. |
| zecchino. | A sequin. |
| zedoary. | Dried rhizome of curcuma. |
| zein. | Corn protein used in plastics, coatings and lacquers. |
| zec. | Soviet labor camp inmate. |
| zemstvo. | Elected local administrative council in Czarist Russia. |
| zenana. | Part of the house in India and Pakistan reserved for the women. |
| Zend-Avesta. | Entire body of Zoroastrian sacred writings. |
| Zethus. | Amphion's twin brother. |
| zeugma. | Construction in which a word is used to govern two or more words, often so that its use is grammatically correct with only one of them. |
| zibeline. | Thick, lustrous fabric of wool and other animal hair. Has a silky nap. |
| zibet. | A civet cat. |
| zill. | One of a pair of metal cymbals attached to the fingers. Belly-dancing. |
| zingy. | 1. Pleasantly stimulating. 2. A zingy gown. |
| zizith. | The tassels of thread on the four corners of Jewish prayer gowns. |
| zoisite. | Gray, brown, or pink, used in ornamental stonework. |
| zoochore. | Plant dispersed by animals. |
| zooglea. | Bacteria that form gelatinous colonies. |
| zooid. | 1. A cell having independent movement within a living organism, such as a spermatozoan. 2.. A microscopic colony animal. |
| zoomorphisn. | 1. Attribution of animal qualities to a god. 2. Use of animal forms in symbolism, literature, or graphic representation. |
| zoon. | Sea anemone or sponge that remains attached to a surface and superficially resembles a plant. |
| zoonosis. | A disease such as malaria or rabies that can be transmitted to man. |
| zooplasty. | Surgical transfer of tissue from an animal to man. |
| zoosperm. | A spermatozoan. |
| zoospore. | A mobile, flagellated, asexual spore. |
| zootechnics. | Breeding technology. |
| zori. | Flat straw or leather sandal. |
| zorille. | African mammal resembling the skunk. |
| zoster. | 1. Belt or girdle. 2. Herpes zoster |
| Zouave. | 1. French Algerian infantry unit. Colorful uniforms, precision drilling. 2. Civil War copy. |
| zucchetto. | Catholic skullcap, like a biretta. |
| zwiterion. | An ion carrying both a positive and a negative charge. |
| zydeco. | Cajun music combining elements of French dance music, Caribbean music, and the blues. Played on a washboard, a guitar, and an accordion. |
| zygaphosis. | One of two usually paired processes of a vertebrate that articulate with corresponding parts of adjacent vertebrae. |
| zygodactyl. | Having two toes projecting forward and two toes projecting backward. A zygodactyl bird. |
| zygoma. | 1. A zygomatic bone. 2. The zygomatic arch. 3. The zygomatic process. |
| zygomatic bon | e.A small quadrangular bone forming part of the orbit and part of the zygomatic arch. |
| zygomatic arch. | The bony arch that extends along the side of front of the skull beneath the orbit. |
| zygomatic process. | Any of the three processes that articulate to make up the zygomatic arch. |
| zygomorphic. | Bilaterally symmetric. |
| zymogen. | The inactive protein precursor of an enzyme. |
| zyzzyva. | Tropical weevil. |