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arduous entailing great difficulty, exertion, or endurance; laborious. [3 definitions]
are1 2nd person present sing. and 1st, 2nd, and 3rd person pl. of be.
are2 a unit of area equal to one hundred square meters or 119.6 square yards.
area a place or region. [4 definitions]
area code in the United States and Canada, any of the three-digit codes that identify the regional telephone districts into which the countries are divided. [2 definitions]
area rug a rug intended to cover only a specific section of a floor.
areaway a sunken area in front of basement doors or windows allowing access from outside, or permitting light and air to pass through. [2 definitions]
areca any of several tall palm trees of tropical Asia, such as the betel palm, having a smooth, slender trunk and feathery leaves and bearing red or orange nuts. [2 definitions]
arena a stage, ring, or other circumscribed area where sporting events or performances are held. [4 definitions]
arenaceous sandy or sandlike. [2 definitions]
arena theater a theater that has a central stage surrounded on at least three sides by seats.
arenicolous living or growing in sand.
arenite sandstone or other rock that is composed chiefly of grains of sand.
aren't contracted form of "are not". ; contracted form of "am not".
areola in anatomy, a small ring of color, as around a human nipple. [2 definitions]
Ares in Greek mythology, the god of war; Mars.
arÍte a sharp, narrow ridge or crest on a mountain.
argali a wild sheep of central and northern Asia that has large spiraling horns.
Argand burner an oil or gas burner having a metal tube inside a cylindrical wick, through which air is conducted directly to the flame.
argent in heraldry, the metal silver or its color. [2 definitions]
argentic of or containing silver, esp. divalent silver.