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''-logy'' is a suffix in the English language, used with words originally adapted from Ancient Greek ending in (''-logia'').〔List of ancient Greek words ending in (-λογία ) on Perseus〕 The earliest English examples were anglicizations of the French ''-logie'', which was in turn inherited from the Latin ''-logia''.〔("-logy." ''The American Heritage Dictionary of the English Language'', Fourth Edition. Houghton Mifflin Company, 2004. retrieved 20 Aug. 2008. )〕 The suffix became productive in English from the 18th century, allowing the formation of new terms with no Latin or Greek precedent. The English suffix has two separate main senses, reflecting two sources of the suffix in Greek:〔("-logy." Dictionary.com Unabridged (v 1.1). Random House, Inc. retrieved 20 Aug. 2008. )〕 *a combining form used in the names of sciences or bodies of knowledge, e.g. ''theology'' (loaned from Latin in the 14th century) or ''sociology''. In words of the type ''theology'', the suffix is derived originally from (''-log-'') (a variant of , ''-leg-''), from the Greek verb (''legein'', "to speak").〔"-logy." ''The Concise Oxford Dictionary of English Etymology''. Oxford University Press, 1986. retrieved 20 August 2008.〕 The suffix has the sense of "the character or deportment of one who speaks or treats of (certain subject )", or more succinctly, "the study of (certain subject )".〔("-logy." ''Online Etymology Dictionary''. retrieved 20 Aug. 2008 )〕 *the root word nouns that refer to kinds of speech, writing or collections of writing, e.g. ''eulogy'' or ''trilogy''. In words of this type, the "-logy" element is derived from the Greek noun (''logos'', "speech", "account", "story").〔 The suffix has the sense of "(certain kind of ) speaking or writing".〔"-logy." ''The Oxford English Dictionary'', Second Edition. Oxford University Press, 1989. retrieved 20 August 2008.〕 Philology is an exception: while its meaning is closer to the first sense, the etymology of the word is similar to the second sense.〔("Philology." ''Online Etymology Dictionary''. retrieved 14 Jul. 2011 )〕 ==-logy versus -ology== In English names for fields of study, the suffix ''-logy'' is most frequently found preceded by the euphonic connective vowel ''o'' so that the word ends in ''-ology''.〔Eric Partridge, ''Origins'', 2nd edition,New York, Macmillan, 1959〕 In these Greek words, the root is always a noun and ''-o-'' is the combining vowel for all declensions of Greek nouns. However, when new names for fields of study are coined in modern English, the formations ending in ''-logy'' almost always add an ''-o-'', except when the root word ends in an "l" or a vowel, as in these exceptions:〔(Words Ending In ogy : Words Ending With ogy )〕 ''analogy'', ''dekalogy'', ''disanalogy'', ''genealogy'', ''genethlialogy'', ''herbalogy'' (a variant of ''herbology''), ''mammalogy'', ''mineralogy'', ''paralogy'', ''pentalogy'', ''petralogy'' (a variant of ''petrology''), ''tetralogy''; ''elogy''; ''antilogy'', ''festilogy'', ''trilogy''; ''palillogy'', ''pyroballogy''; ''dyslogy''; ''eulogy''; and ''brachylogy''.〔 Linguists sometimes jokingly refer to haplology as ''haplogy'' (subjecting the word ''haplology'' to the process of haplology itself). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「-logy」の詳細全文を読む スポンサード リンク
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