LSJ
mark off with the τόρνος, make round, τορνώσαντο σῆμα they rounded off the barrow, Il. 23.255; ὅσσον τίς τ’ ἔδαφος νηὸς τορνώσεται large as the bottom of a ship which a man shall round off, with allusion to the round shape of a merchant vessel (cf. γαῦλος), opp. to a ship of war, Od. 5.249, cf. D.P. 1170, Tryph. 64. — Act. τορνῶσαι· περιγράψαι, κυκλῶσαι, Hsch., who also has Pass. τορνοῦμαι δὲ πρὸς μέτρον· ἀντὶ τοῦ περιγράφομαι (perh. a Trag. fragment).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)