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thyme (n.)

plant of the mint family, late 14c., from Old French thym, tym (13c.) and directly from Latin thymum, from Greek thymon, which had been derived from PIE root *dheu- (1), base of words meaning "smoke," for its scent or from being burned as a sacrifice, but Beekes finds this "doubtful" and suggests that "As a local plant name, the word is liable to be of Pre-Greek origin." Related: Thymic.