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Comprehensive
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a2 any one of a group or kind. [2/3 definitions]
abandon ship to extricate oneself from a situation where danger or failure seems imminent, often at the expense of loyalty to a group or cause. [1/2 definitions]
accent a manner of speaking characteristic of a particular person, group of people, or geographic region. [1/8 definitions]
accepted welcomed into a group or society; approved. [1/2 definitions]
acculturation in sociology, the process of taking on the ways and values of a society or group.
-aceous of or relating to a (specified) botanical or zoological group. [1/3 definitions]
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.) [1/7 definitions]
acrylic fiber any of a group of synthetic fibers that are made chiefly of acrylonitrile that has been formed into polymers.
acrylic resin any of a group of transparent synthetic resins that become pliable or set when heated and are used in acrylic fibers, plastics, and synthetic rubbers.
actin any of a group of contractile proteins, including proteins involved in muscle contraction, cell motility, and maintenance of cellular shape.
actinium a radioactive chemical element of the rare-earth group that has eighty-nine protons in each nucleus. (symbol: Ac)
adenovirus any of a group of viruses that causes disease of the upper respiratory tract.
advance man an agent or aide who takes care of publicity, security, and other arrangements in advance of the appearance of a politician, theater group, or the like.
adversary a person, group, or thing opposed to another; opponent; enemy.
aflatoxin any of a group of toxic compounds produced by certain molds, esp. those in the genus Aspergillus. Consumption of food contaminated with these molds can cause liver disease and cancer.
aggressor a person, group, animal, or nation that starts aggression against another.
aldehyde in chemistry, any of a group of organic compounds, such as formaldehyde, the molecule of which contains a terminal carbon atom bound separately to a hydrogen and an oxygen atom.
alien one who is considered foreign to a particular group or family; outsider. [1/6 definitions]
alkali metal any of a group of highly reactive chemical elements, such as sodium and potassium, that are typically univalent cations forming various compounds, but that can be isolated as soft, low-density metals.
alkaline-earth metal any of a group of highly reactive chemical elements, such as calcium and magnesium, that are typically divalent cations and form compounds with various other elements.
alkalinize to produce an alkali from (a chemical group). [1/2 definitions]