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aceto- pertaining to or containing acetic acid or acetyl.
acetone a chemical compound, highly volatile and flammable, used in making compounds and as a solvent, as in paints.
acetophenetidin a white powder or crystalline solid used to relieve fever and pain; phenacetin.
acetylcholine in biochemistry, the substance produced during nerve conduction that transmits nerve impulses across synapses and causes muscles to move. [2 definitions]
acetylene a highly flammable colorless gas used esp. to cut and weld metal and to give light.
acetylsalicylic acid aspirin.
acey-deucy a form of backgammon that assigns a special value to a throw of a one or a two.
Achaea an historic region of Greece along the northern coast of the Peloponnesus. [2 definitions]
Achaean of or pertaining to Achaea, a historic region of Greece along the northern coast of the Peloponnesus. [3 definitions]
ache to produce or experience a dull, constant pain. [4 definitions]
achene a small, dry, hard seed that is attached at a single point and that does not split open when it is mature.
achieve to reach or carry through successfully; accomplish. [3 definitions]
achievement something successfully carried through, esp. through bold or brave action or thought. [2 definitions]
Achilles the hero of The Iliad, who is killed by an arrow in his heel, his only vulnerable spot.
Achilles heel any vulnerable or weak spot, part, or trait.
Achilles tendon the large tendon that connects the calf muscles to the back of the heel.
achromatic consisting of black, gray, or white; colorless. [3 definitions]
achromic lacking color; colorless.
achy feeling an ache or aches.
acid in chemistry, any of a group of substances that usu. dissolve in water, have a sour taste, and form salts in reaction with bases. (Cf. base.) [7 definitions]
acidic like acid in taste, smell, pungency, or the like; acid. [3 definitions]