missor, ōris, m. [mitto],
one who sends, throws , or shoots, an archer (very rare): hic missore vacans fulgens jacet una sagitta (al.: hic misso revocans), Cic. Arat. 84.
missor ōris, m mitto, a thrower, archer : missore vacans sagitta, C.poët. ...
An Elementary Latin Dictionary