Extended Strong's Greek Lexicon (Abbott-Smith based)
track
Usage: ἴχνος, -εος (-ους), τό [in LXX for כַּף, etc. ;] a track, footstep: metaphorically (as frequently in cl.), στοιχεῖν τοῖς ἴ., Rom.4:12; περιπατεῖν τοῖς ἴ., 2Co.12:18; ἐπακολουθεῖν τοῖς ἴ., 1Pe.2:21 (cf. MM, Exp., xv).† (AS)