From the scholia to Homer, Iliad 18.292, where the headword occurs; it is the third person singular aorist of the verb ὀδύσσομαι or ὀδυίομαι (LSJ entry at web address 1). This is primarily an epic verb and was seen as the origin of the name Odysseus. The pun appears at Odyssey 1.62 (web address 2); 5.340, 423; 16.145-7; 19.275, 407-9; see also Sophocles fr.880 Nauck (= 965 Pearson). Similar glosses in Photius, Hesychius, and other lexica.