Trimeter
A line of verse with three feet is known as trimeter (pronounced
with a short i in the first syllable -- not "try-meter").
Trimeter on its own is rare in English, although, when alternated
with tetrameter, it makes ballad stanza.
From the Guide to Literary Terms by Jack Lynch.
Please send comments to jlynch@andromeda.rutgers.edu.
Note: This guide is still in the early stages of development. Bear with me.