A metrical unit with stressed-unstressed syllables WordNet 3.0 & Open English WordNet

In poetic metre, a trochee is a metrical foot consisting of a stressed syllable followed by an unstressed one, in qualitative meter, as found in English, and in modern linguistics; or in qualitative meter, as found in Latin and Ancient Greek, a heavy syllable followed by a light one. Wikipedia

Metrical foot Wikidata

A metrical foot in verse consisting of a stressed syllable followed by an unstressed syllable. Wiktionary

A metrical foot. Wiktionary (translation)