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ETYMOLOGY DICTIONARY:
- petro- (1)
- before vowels petr-, word-forming element used from 19c., from comb. form of Gk. petros "stone," petra "rock" (see petrous).
- word-forming element indicating "branch of knowledge, science," now the usual form of -logy. Originally used c.1800 in nonce formations (commonsensology, etc.), it gained legitimacy by influence of the proper formation in geology, mythology, etc., where the -o- is a stem vowel in the previous element.
- word-forming element meaning "a speaking, discourse, treatise, doctrine, theory, science," from Gk. -logia (often via Fr. -logie or M.L. -logia), from root of legein "to speak;" thus, "the character or deportment of one who speaks or treats of (a certain subject);" see lecture (n.).
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