Bible Dictionary

Gashmu

a variation of the name Geshem. (Nehemiah 6:6) (B.C. 446.)

Smith's Bible Dictionary (1863)

a variation of the name Geshem.

Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary

GASH'MU (rain), a form of the name Geshem; used in Neh 6:6.