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a variation of the name GESHEM. ( Nehemiah 6:6 ) (B.C. 446.)
gash'-mu, gash'-moo (gashmu):
A form of the name GESHEM (which see), found in Nehemiah 6:6 (compare Nehemiah 6:1), "And Gashmu saith it." According to BDB the same termination -u is found in Nabatean proper names.
Orr, James, M.A., D.D. General Editor. "Entry for 'GASHMU'". "International Standard Bible Encyclopedia". 1915.