A dimeter is a metrical line of verse with two feet.
Consider Thomas Hood's "Bridge of Sighs:" Take her up \\ tenderly, Lift her with \\ care, Fashioned so \\ slenderly, Young and so \\ fair.
\Dim"e*ter\, a. [L. dimeter, Gr. ?; di- = di`s- twice + ? measure.] Having two poetical measures or meters. -- n. A verse of two meters.