Where does “iambus” come from?

iambus (Latin) comes from Ancient Greek ἴαμβος, from Ancient Greek ἰάπτω — to send forth, drive on, shoot; to rush, hurry.

iambus (Latin): iamb, iambus; iambic verse

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	ἴαμβος	iamb, a metrical foot; iambic verse or poem;...
2	Ancient Greek	ἰάπτω	to send forth, drive on, shoot; to rush, hurry