Etymology
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biological (adj.)

"pertaining to the science of life," 1840, from biology + -ical. Biological clock, "innate mechanism that regulates cyclic activities of living things," is attested from 1955; not especially of human reproductive urges until c. 1991. Biological warfare is attested from 1946. Related: Biologically. Alternative adjective biologic is from 1850.

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reductionism (n.)

1948, in philosophy, from reduction in specialized sense in philosophy (1914) + -ism. Related: Reductionist.

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reductionist (n.)

1861 and after, "one who favors reduction" in various senses, from reduction + -ist. Philosophical sense, related to reductionism, is from 1934. Related: Reductionistic.

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weapons of mass destruction (n.)

"nuclear, biological and chemical weapons" attested by 1946, apparently first used (in Russian) by the Soviets.

The terms "weapons of mass destruction" and "WMD" mean chemical, biological, and nuclear weapons, and chemical, biological, and nuclear materials used in the manufacture of such weapons. [United States Code: Title 50, "War and National Defense," chapter 43, § 2902, 2009]
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sociobiology (n.)

"study of the biological basis of social behavior," 1946, from socio- + biology. Related: Sociobiological.

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morphogeny (n.)

in Haeckel's system, biological development of the forms of organisms, 1851; see morpho- + -geny.

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bryology (n.)

1823, "biological science of mosses and their relatives," from bryo- "moss" + -logy. Related: Bryologist (1826); bryological.

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raciation (n.)

"evolutionary development of biological races," by 1946, from race (n.2) + ending from speciation, etc.

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bioterrorism (n.)

also bio-terrorism, "terrorism involving biological agents," by 1997, from bio- + terrorism. Related: Bioterrorist.

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parasitic (adj.)

"of pertaining to, or characteristic of a parasite," in any sense, 1620s, from Latin parasiticus, from Greek parasitikos "of or pertaining to a parasite; the trade of a parasite," from parasitos "one who lives at another's expense" (see parasite). Biological sense is from 1731. Related: Parasitical, 1570s in reference to toadies; from 1640s in the biological sense.

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