Anisometric verse, known also as heterometric stanza, is a type of poetry where the stanza is made up of lines having unequal metrical length.
In poetry, a foot is a group of syllables patterned according to their weight, stress, or accent relative to each other.
Two exceptions are William Wordsworth's Ode: Intimations of Immortality, and Afanasy Fet's Flights Beyond Fancy or Fantasy.
The term anisometry is used often by Professor Emily Klenin in her published analysis of Fet's works: The Poetics of Afanasy Fet.
For example, the following verse would be anisometric: Though this verse is witty and clever And writing it took no time It's all anisometric, using meters much as you would a lever