Summary: The Greek root word *log* means 'word,' and its variant suffix *-logy* means 'study (of).' Some common English words that use this root include bio[*logy*], mytho[*logy*], cata[*log*], and pro[*log*]ue. Bio[*logy*], of course, is the 'study' of life, whereas a pro[*log*]ue constitutes the 'words' spoken to introduce a poem or novel.
