myEtymology.com: Greek etymology of -logos

Etymology of the Greek suffix -logos (-λόγος)

the Greek suffix -logos, -λόγος

derived from the Greek word logos, λόγος (word, speech, topic, treatise, reasoning)

derived from the Greek word legein, λέγω (to speak)

derived from the Proto-Indo-European root *leg- (to collect, to speak)

English biology, French monologue, French -logue, Latin -logus