English (Abbott-Smith)
Πέτρος, -ου, ὁ (i.e. a stone, v.s. πέτρα, Κηφᾶς),
Simon Peter, the Apostle: Mt 4:18 10:2, Mk 3:16, Lk 5:8, Jo 1:41, 43, al.
English (Strong)
apparently a primary word; a (piece of) rock (larger than λίθος); as a name, Petrus, an apostle: Peter, rock. Compare Κηφᾶς.