Likewise or similarly in other lexica.
The helepolis was a large mobile siege-tower, originating in the late C4 BCE, with the engineers and designers serving King Demetrius Poliorcetes ("The Besieger"). Marsden 84-5 suggests that the name was suggested by the application of the adjective e(le/ptolis in tragedy to Helen (Aeschylus, Agamemnon 689) and Iphigeneia (Euripides, Iphigeneia in Aulis 1476, 1511).