M / mĕsŏbrăchys
greek

mĕsŏbrăchys

= μεσόβραχυς (sc. pes)
a poetical foot of five syllables, of which only the middle one is short
a poetical foot of five syllables, of which only the middle one is short (e. g. pulcherrĭmarum; opp. to mesomacros), Diom. p. 479 P.