The Bedford Glossary of Critical and Literary Terms - Ross Murfin 2018
Monometer
Monometer: A line of verse consisting of one metrical foot.
EXAMPLES: Robert Herrick’s “Upon His Departure Hence” (1648), written in iambic monometer, which begins “Thus I / Pass By / And die”; the anonymous trochaic monometer poem “Fleas,” reading simply “Adam / Had’em.” William Carlos Williams’s “Poem” (1934) contains several monometer lines:
As the cat
climbed over
the top of
the jamcloset
first the right
forefoot
carefully
then the hind
stepped down
into the pit of
the empty
flowerpot