Abbott-Smith Manual Greek Lexicon
ψῆφος (G5586)
3 ψῆφος , -ου, ἡ ( ψάω , to rub) [in LXX: Ex 4:25 ( צֹר ), La 3:16 ( חָצָץ ), Ec 7:26 (25) ( חֶשְׁבּוֺך ), IV Ki 12:4 (5) A, Si 18:10 , IV Mac 15:26 * ;] a small smooth stone, a pebble : ψ. λευκή (for suggestions as to the meaning, v. Swete, in l.), Re 2:17 . From the use of pebbles in voting, a vote : Ac 26:10 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain