Source : Webster's Revised Unabridged Dictionary (1913)

Exsert \Ex*sert"\, v. t. [imp. & p. p. {Exserted}; p. pr. & vb.
   n. {Exserting}.] [See {Exsert}, a., {Exert}.]
   To thrust out; to protrude; as, some worms are said to exsert
   the proboscis.