LSJ
οἱ, (δρυ- ΄wooden structure΄, ΄ship’ (cf. δόρυ), ἔχω) props or shores upon which is laid the frame of a new ship, Od. 19.574, cf. Eust. et Sch. ad loc. ; κατὰ δρυόχων ἐπάγη σανίς Epigr. ap. Moschion ap. Ath. 5.209c; ἐκ δρυόχων ναυπηγεῖσθαι to build a ship from the keel, Plb. 1.38.5; δρυόχους ἐπεβάλλετο νηός A.R. 1.723; metaph, δρυόχους τιθέναι δράματος ἀρχάς to lay the keel of a new play, Ar. Th. 52; οἷον ἐκ δρυόχων Pl. Ti. 81b, cf. Plu. 2.321e; sg. only in Poll. 1.85. = δρυμά, woods, AP 6.16 (Arch.); heterocl. pl. δρύοχα E. El. 1163 (lyr.).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)