Extended Strong's Greek Lexicon (Abbott-Smith based)
interest
Usage: τόκος, -ου, ὁ (τίκτω), [in LXX for נֶשֶׁךְ, etc. ;] __(a) a bringing forth, birth; __(b) offspring. Metaphorical, of the produce of money lent out, interest, usury (cf. Merch. of Venice, I, iii, "a breed of barren metal "): Mat.25:27, Luk.19:23 (Soph., Plat., al.).† (AS)