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Achaean of or pertaining to Achaea, an 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]
acidify to make or change into acid. [2 definitions]
acidity the characteristic or state of being acid. [3 definitions]
acidosis an abnormally high acidity of body tissues and fluids.
acid rain rain that has high acidity because of being mixed with pollutants such as vehicle exhausts and residues from burning of fossil fuels for energy or from chemical manufacturing.
acid rock a form of music popular in the late 1960s and early 1970s that has loud, often distorted sounds and harmonies, and lyrics that suggest psychedelic experiences.
acid test a stringent, crucial, or definitive test of value or quality.
acidulate to cause to become slightly acid.
acidulous faintly sour in taste; of mild acidity. [2 definitions]