Dimeter

In poetry, a dimeter /ˈdɪmɪtər/ is a metrical line of verse with two feet. The particular foot, of course, can vary.

Consider Thomas Hood's "Bridge of Sighs:", in which the first line of a pair is of two feet, each composed of three syllables, and the subsequent line is of two feet, each of two syllables.

Take her up tenderly, Lift her with care, Fashioned so slenderly, Young and so fair.

Also, the first line of William Wordsworth's "We Are Seven":

A simp le Child