ἡμίβραχυς
From LSJ
ὁ κόσμος ἀλλοίωσις, ὁ βίος ὑπόληψις → the universe is flux, life is opinion | the universe is transformation: life is opinion | the universe is change, life is a fleeting impression | the universe—mutation: life—opinion
English (LSJ)
εια, υ, in prosody,
A half of a short, ἡμιβράχεια (sc. προσῳδία) Sch.D.T.p.207 H.: pl., ἡμιβράχεα, τά, ib.p.208 H.
Greek (Liddell-Scott)
ἡμίβρᾰχυς: υ, κατὰ τὸ ἥμισυ βραχύς, Α. Β. 824.