bacchius

[buh-kahy-uh s, ba-] /bəˈkaɪ əs, bæ-/
noun, plural bacchii
[buh-kahy-ahy, ba-] /bəˈkaɪ aɪ, bæ-/ (Show IPA).
Prosody
1.
a foot of three syllables that in quantitative meter consists of one short syllable followed by two long ones, and that in accentual meter consists of one unstressed syllable followed by two stressed ones.
Compare antibacchius.
Origin
1580-90; < Latin < Greek Bakkheîos (poús) (foot) of Bacchus
British Dictionary definitions for bacchius

bacchius

/bæˈkaɪəs/
noun (pl) -chii (-ˈkaɪaɪ)
1.
(prosody) a metrical foot of one short syllable followed by two long ones (◡ – –) Compare dactyl
Word Origin
C16: from Latin, from Greek Bakkheios (pous) a Bacchic (foot)