Etymology
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lexicology (n.)
"the study of words," including form, history, and sense, 1828, from lexico- + -logy. Related: Lexicology; lexicologist.
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entomologist (n.)

"one versed in or engaged in the study of insects," 1771; see entomology + -ist.

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polemology (n.)

"the study of war," 1870, from Greek polemos "war," a word of unknown origin, + connective -o- + -logy.

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folklorist (n.)
also folk-lorist, "one engaged in the study of folklore," 1881, from folklore + -ist.
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bacteriology (n.)
"scientific study of microbes," 1884, from German; see bacteria + -ology. Related: Bacteriological (1886); bacteriologist. Bacteriological warfare is from 1924.
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bioclimatology (n.)
also bio-climatology, "study of climate in relation to living organisms," 1911; see bio- + climatology.
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penology (n.)

"study of punishment for crime and crime prevention," 1838, coined apparently by Francis Lieber, corresponding member of the Philadephia Society for Alleviating the Miseries of Public Prisons, from pen- as in penitentiary (ultimately from Latin poena "penalty, punishment;" see penal) + -ology "study of." Related: Penologist; penological.

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irenology (n.)

"study of peace," 1974, from Greek eirēnē "peace" (which is of unknown etymology) + -ology. Related: Irenological.

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extemporary (adj.)

"composed or uttered without previous study or preparation," c. 1600, from extempore + -ary.

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climatology (n.)

"scientific study of climates," 1803, from climate + -ology.  In 19c., more or less equivalent to meteorology

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