Abbott-Smith Manual Greek Lexicon
πέτρα (G4073)
15 πέτρα , -ας, ἡ , [in LXX chiefly for סֶלַע , צוּר ;] a rock , i.e. a mass of live rock as distinct from πέτρος , a detached stone or boulder: Mt 7:24 , 25 27:51 , 60 , Mk 15:46 , Lk 6:48 8:6 , 13 ; of a hollow rock, a cave , Re 6:15 , 16 (cf. Is 2:10 , al.). Metaph., Mt 16:18 (on the meaning, v. Hort, Eccl. , 16 ff., but cf. also ICC , in l.), I Co 10:4 ; = πέτρος , Ro 9:33 , I Pe 2:8 (LXX) .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain