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yarrow any of a variety of plants native to Eurasia that have feathery, fernlike leaves, bear tight clusters of small white, pink, or yellow flowers, and are sometimes used as medicine.
yashmak the veil worn by Muslim women in public.
yataghan a Turkish sword with a double-curved blade and a hilt with a prominent pommel and no guard.
yaw to weave, move unsteadily, turn, or pitch from side to side, esp. on a vertical axis. [4 definitions]
yawl a two-masted sailing ship having a large mainmast on the foredeck and a smaller mizzenmast behind the rudderpost. (Cf. ketch.) [2 definitions]
yawn to open the mouth involuntarily while breathing in deeply, usu. as a sign of tiredness, boredom, or the like. [4 definitions]
yawp (informal) to utter a loud sharp cry; yelp. [2 definitions]
yaws (used with a sing. verb) a tropical disease caused by a spirochete and characterized by the eruption of red, berrylike growths on the skin.
y-axis in a two-dimensional coordinate system, the vertical axis along which the y ordinates are measured. [2 definitions]
yay (informal) used as an expression of celebration in connection with a certain result.
Yb symbol of the chemical element ytterbium.
Y chromosome a sex chromosome that occurs only in males, paired with an X chromosome, and is responsible for male sex characteristics. (Cf. X chromosome.)
yd. abbreviation of "yard," a unit of length equal to three feet or 0.9144 meter.
ye1 an archaic form of "you."
ye2 the. Ye is a misreading of an old spelling of "the" in which the letter for the "th" sound looked like a "y." When stores today put "ye" on their signs, they do so in order to look old-fashioned.
yea yes (used to indicate affirmation or agreement). [5 definitions]
yeah (informal) yes.
yean of a sheep or goat, to bear young.
yeanling the young offspring of a sheep or goat; lamb or kid.
year a unit of time equal to 365 days or, every fourth year, 366 days, reckoned in the Gregorian calendar from January through December; twelve months. (abbr.: yr.) [5 definitions]
yearbook an annually published book containing information, statistics, and historical data about the previous year. [2 definitions]