HEPHTHEMIMERIS (composed of ἥπτα seven, μισμός half, and ἡμέρα part), in the Greek and Latin poetry, a sort of verse consisting of three feet and a syllable; that is, of seven half feet.
Such are most of the verses in Anacreon:
And that of Aristophanes, in his Plutus:
Ἐνὶ δὲ μὲν γὰρ γὰρ.
They are also called trimetri catalectic.