Henry George Liddell, Robert Scott, A Greek-English Lexicon

A.high, steep, always in Hom. as epith. of πέτρη or πέτραι, Il.15.273, al., cf. Hes.Th.675, 786, Thgn.176, Pi. O.6.64, A.Supp.352 (lyr.), E.Supp.80 (lyr.), Theoc.26.10, etc.; ὄρος, ἄκρη, ἐρίπναι, A.R.2.169, 361, 1248; of the Olympian throne of Zeus, Ar.Av.1732; of trees, h.Ven.267 (so prob. in Hes.Sc.422).—Also in X. and later Prose, πέτραι ἠ. An.1.4.4; “τόποι” Plb.4.41.9; “πέτρος” Str.17.1.50; “δένδρα” Agatharch.97; “πῦρ” Hanno Peripl.16; σταυρός Epigr. ap. Plu.Flam.9.

II. deep, abysmal, ἄντρῳ ἐν ἠ. Hes.Th. 483; Τάρταρος ἠ. Stes.83; “ἠ. ὑπὸ κευθμῶσι” E.Hipp.732 (lyr.); πελάγεσσιν ἐν ἠ. Opp.H.3.171: metaph., κακὸν ἠ. Damox.2.22; “εὐηθεια” Porph.Abst.1.12.

III. in later Poets (perh. from a misunderstanding of [“Κύκλωψ] ἠ. πέτρην ἐπέθηκε θύρῃσιν” Od.9.243), huge, enormous, “μέλεα” Opp.H.5.66; “σχεδίη” Q.S.11.312; so in Prose, κῦμα, σκιαί, Plu.2.163c,935f. (Etym. dub., cf. ἄλιψ: πέτρα, Hsch.）