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annulus a ring-shaped part, structure, or area.
aquiculture the growing of plants, often for their edible fruits, in nutrient water or water-soaked inert material rather than in soil; hydroponics. [1/2 definitions]
arbovirus any of a number of viruses that are transmitted by certain blood-sucking arthropods such as mosquitoes and ticks and that may cause encephalitis, yellow fever, or dengue fever.
argyle of a knitted article, having a diamond-shaped pattern of two or more colors. [2/3 definitions]
arrowhead the wedge-shaped barb on the striking end of an arrow. [2/3 definitions]
arsenic acid a poisonous, water-soluble white powder that is used in the making of arsenates, medicines, and insecticides.
arum any of a family of plants, such as jack-in-the-pulpit, with arrow-shaped leaves and bearing a flower, at the tip of a long spike, that is enclosed by a hoodlike leaf. [1/2 definitions]
Ashkenazim Jews, usu. Yiddish-speaking, of eastern and central Europe, or their descendants. (Cf. Sephardim.)
atoll a ring-shaped island or reef that surrounds a lagoon.
attar a pleasant-smelling oil extracted from flower petals.
auld lang syne (cap.) a Scottish song traditionally sung at midnight on New Year's Eve in many English-speaking countries. The contemporary melody is also popular in many other countries but may be sung on different occasions and with different lyrics. [1/2 definitions]
autarky a national policy of economic self-sufficiency, involving not relying on economic aid or on imports. [2 definitions]
avocado a pear-shaped edible tropical American fruit with a green or black skin, usu. eaten raw in salads or the like. [1/2 definitions]
babushka a woman's scarf, usu. triangle-shaped, that is worn on the head and tied under the chin.
bacillary rod-shaped. [1/2 definitions]
bacillus any rod-shaped bacterium that is active only in the presence of oxygen, or one composed of a chain of rod-shaped elements. [1/2 definitions]
bagel a leavened, ring-shaped bread roll with a dense, chewy texture.
bait-and-switch of or relating to a bait-and-switch. [1/2 definitions]
ball-and-socket joint a skeletal joint in which the ball-shaped end of a bone, often part of a limb, fits into and rotates quite freely within the hollow, spherical socket of another bone. [1/2 definitions]
ball joint a mechanical joint, often found in tools and machines, in which the ball-shaped end of a rod or pipe is fitted into a hollow socket, enabling the inserted part to rotate freely in any direction.
bantam (often cap.) a member of a small-sized breed of chicken, sometimes the miniature version of a larger breed. [1/3 definitions]