Amphibrach

a trisyllabic foot, the arrangement of the syllables of which is short, long, short in quant-tative meter, or unstressed, stressed, unstressed in accentual meter. thus, together is an accentual amphibrach.
historical examples

the amphibrach is a foot of three syllables, the first and third short, and the second long.
dissertation on the english language noah webster, jr.

similarly, such a word as alighted, in which a strong syllable is situated between two weak ones, may be called an ‘amphibrach.’
chaucer’s works, volume 6 (of 7) — introduction, glossary, and indexes geoffrey chaucer

but these lines are of the high burlesque kind, and in this stile the amphibrach closes lines with great beauty.
dissertation on the english language noah webster, jr.

the amphibrach plays a highly important part in english verse, though it is usual not to mention it at all.
chaucer’s works, volume 6 (of 7) — introduction, glossary, and indexes geoffrey chaucer

similarly, the symbol means a trochee; and the symbol means an amphibrach.
chaucer’s works, volume 6 (of 7) — introduction, glossary, and indexes geoffrey chaucer

again, i should say, anapaestic—but this anapaest and amphibrach quarrel is ἄσπονδος.
the complete poetical works of samuel taylor coleridge samuel taylor coleridge

noun
(prosody) a metrical foot consisting of a long syllable between two short syllables (◡ – ◡) compare cretic
n.

1580s, from latin amphibrachus, from greek amphibrakhys, a foot consisting of a long syllable between two short, literally “short at both ends,” from amphi- “on both sides” (see amphi-) + brakhys “short” (see brief (adj.)).