ἡμίβραχυς
From LSJ
περὶ οὐδὲν γὰρ οὕτως ὑπάρχει τῶν ἀνθρωπίνων ἔργων βεβαιότης ὡς περὶ τὰς ἐνεργείας τὰς κατ' ἀρετήν → since none of man's functions possess the quality of permanence so fully as the activities in conformity with virtue
English (LSJ)
εια, υ, in prosody, 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.