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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]
acinus one of the small divisions in an aggregate fruit such as a blackberry. [2 definitions]
-acious characterized by; full of or tending toward.
-acity (such) a characteristic, condition, or tendency.
acknowledge to admit or recognize the truth, existence or validity of. [4 definitions]
acknowledgment the act of acknowledging, or the fact of being acknowledged. [2 definitions]
ACLU abbreviation of "American Civil Liberties Union," an organization that works to defend and preserve the civil rights of citizens in the United States.
acme the highest point, as of attainment; pinnacle.
acne a skin disorder caused by inflammation of the oil glands, resulting in pimples, usu. on the face.
acolyte a person who assists a clergyman in religious services, esp. Roman Catholic. [2 definitions]
aconite a plant of the buttercup family, that has poisonous and medicinal properties; monkshood. [2 definitions]
acorn the fruit of the oak tree, having a smooth, ovoid nut partially enclosed by a rough, cuplike base.
acorn squash a variety of winter squash with a ridged acorn shape and dark green skin.
acoustic having to do with sound or the science of sound, or with the sensation and organs of hearing. [3 definitions]