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yolk the yellow nutritive substance in an egg, consisting of protein and fat, that is involved directly in the formation of the embryo.
yolk sac a membranous sac that nourishes the embryos of primitive mammals, bony fishes, sharks, reptiles, and birds. [2 definitions]
Yom Kippur the Jewish Day of Atonement, observed as a day of fasting, prayer, and repentance on the tenth day of Tishri, and regarded as the holiest day in the religious calendar.
yonder (informal) somewhat distant but usu. within sight. [2 definitions]
yoo-hoo used to attract someone's attention.
yore time long ago (prec. by of).
Yorkshire a county of northern England. [2 definitions]
Yorkshire pudding a dish made by baking an unsweetened batter of eggs, milk, flour, and salt in the drippings of roasted meat.
Yorkshire terrier an English breed of toy terrier having a long coat of silky fur that is bluish gray on the body and tan on the head and chest.
Yoruba a member of a West African people who live mainly in western Nigeria. [2 definitions]
you the person or persons being addressed. [2 definitions]
you-all (informal) used in addressing two or more persons, or in referring to two or more persons, one of whom is addressed; you.
you bet (informal) to be sure; of course.
you'd contracted form of "you would". ; contracted form of "you had".
you'll contracted form of "you will".
young at an early stage of life, growth, or development. [7 definitions]
youngberry a hybrid, dark red berry that is a cross between a blackberry and a dewberry, cultivated in the southwestern United States. [2 definitions]
young blood youthful people; youth. [2 definitions]
younger comparative of young. [2 definitions]
youngest superlative of young. [2 definitions]
youngish comparatively young.