Ob`mu·tes'cence (ŏb`mu*tĕs's e ns) noun [ Latin obmutescens , p. pr of obmutescere to become dumb; ob (see Ob- ) + mutescere to grow dumb, from mutus dumb.] 1. A becoming dumb; loss of speech. Sir T. Browne. 2. ... Found on http://www.encyclo.co.uk/webster/O/4