Etymology
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serology (n.)

1907, from sero-, combining form of serum, + -logy. Related: Serological; serologist.

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hydrology (n.)
"the science of water," 1762, from hydro- + -logy. Related: Hydrologist; hydrological (1660s).
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typology (n.)
"doctrine of symbols," 1845, from Greek typos (see type (n.)) + -logy. Related: Typological; typologically.
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topology (n.)
1650s, "study of the locations where plants are found," from Greek topos "place" (see topos) + -logy. Related: Topological.
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chirology (n.)

"art or practice of finger-spelling, use of the manual alphabet," 1650s, from chiro- "hand" + -logy "a speaking."

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dermatology (n.)

"the science of the skin and its diseases," 1819, from dermat- "skin" + -logy. Related: Dermatological.

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ornithology (n.)

"scientific study or knowledge of birds," 1670s, from Modern Latin ornithologia (1590s); see ornitho- + -logy.

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planktology (n.)

"scientific study of plankton," 1892, from German planktologie (1891); see plankton + -logy. The native formation planktonology (1896) is less common.

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oenology (n.)

"the science of wines, the study of the nature, qualities, and varieties of wine," 1781, from oeno- "wine" + -logy. Related: Oenological; oenologist.

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ichthyology (n.)

"the science of fishes; the department of zoology which treats of fishes," 1640s, from ichthyo- "fish" + -logy. Related: Ichthyologist; ichthyological.

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