Etymology
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phycology (n.)

"study of seaweeds, the department of botany that treats of algae or seaweed," 1847, from phyco- + -logy. Related: Phycological; phycologist.

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petrology (n.)

"the study of rocks and their mineralogical composition," 1811 (erroneously as petralogy), from petro- (1) "rock" + -logy. Related: Petrological; petrologist.

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phonology (n.)

"the science of the sounds uttered by the human voice or used in a particular language, phonetics; that part of grammar which treats of pronunciation; the system of sounds and of their combinations in a language," 1799, from phono- + -logy. Related: Phonologist; phonologic.

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psephology (n.)

"the study of voting and elections," 1952, from Greek psēphizein "to vote" (properly "to vote with pebbles," from psēphos "pebble;" see psephocracy) + -logy.

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epidemiology (n.)
"study of epidemics, science of epidemic diseases," 1850, from Greek epidemios, literally "among the people, of one's countrymen at home" (see epidemic) + -logy. Related: Epidemiological; epidemiologist.
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limnology (n.)
study of lakes and fresh water, 1892; see limno- + -logy. The science founded and the name probably coined by Swiss geologist François-Alphonse Forel (1841-1912). Related: Limnological; limnologist.
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symptomatology (n.)
study of symptoms, 1737, from medical Latin symptomatologia, from symptomat-, stem of symptoma (see symptom) + -logia (see -logy). Related: Symptomatological.
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toxicology (n.)
1815, from French toxicologie (1812), from Latinized form of Greek toxikon "arrow poison" (see toxic) + -logia (see -logy). Related: Toxicological; toxicologist.
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necrology (n.)

"register of deaths, obituary notices," 1705, from necro- "death" + -logy. Originally of those connected with a certain institution; by 1854 in reference to persons who died within a certain time. Related: Necrologic; necrological; necrologist.

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mineralogy (n.)

"science which treats of the properties of minerals," 1680s, a hybrid from mineral (n.) + -logy or else from French minéralogie (1640s). Related: Mineralogist; mineralogical.

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