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| acetabulum |
the cup-shaped socket of the hipbone into which the top of the thighbone fits. [1/2 definitions] |
| acetamide |
a colorless water-soluble crystalline solid used esp. in forming organic compounds. |
| actinoid |
having a radial or star-shaped form, as certain sea creatures. |
| admiral |
any of a family of brightly colored, medium to large-sized butterflies, found worldwide. [1/2 definitions] |
| agribusiness |
large-scale industrial agriculture and related activities such as food-processing, equipment manufacture, and marketing. |
| airline |
a tube or hose used to carry air to where it will be used, as to a deep-sea diver. [1/2 definitions] |
| alexandrine |
(sometimes cap.) in poetry, a twelve-syllable line with alternating unstressed and stressed syllables, usu. with a clear pause after six syllables. [1/2 definitions] |
| all-star |
a player on an all-star team. [1/2 definitions] |
| aluminum sulfate |
a white, water-soluble substance used to purify water, manufacture paper, and fix dyes. |
| amanita |
any of various, mostly poisonous mushrooms having blade-shaped gills on the underside. |
| American Beauty |
a type of hybrid rose that bears long-stemmed red flowers. |
| ammoniac |
a sharp-smelling gum resin from the stem of an Asian plant, used in perfumes and porcelain cements; gum ammoniac. [1/2 definitions] |
| ammonium sulfate |
a water-soluble salt, used mainly to purify water and as a fertilizer. |
| ampulla |
an enlarged part of a tube or canal, as of a milk canal in the milk-secreting glands of a mammal. [1/2 definitions] |
| anabasis |
any large-scale military expedition or march, esp. one from a coast to the interior. |
| ancient Rome |
a civilization cultivated by the city-state of Rome from the 8th century B.C.E. through its development as a republic and its collapse as an empire in the 5th century A.D. |
| Anglo-Saxon |
of, pertaining to, or characteristic of Anglo-Saxons or their language, culture, or the like. [1/5 definitions] |
| angostura bark |
the bitter, strong-smelling bark of either of two South American rue trees, used in medicine and as a flavoring in bitters. |
| annular |
ring-shaped. |
| annular eclipse |
an eclipse of the sun in which a ring-shaped portion of the sun remains visible around the moon. |
| annulus |
a ring-shaped part, structure, or area. |
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