Source : Webster's Revised Unabridged Dictionary (1913)

Tenaille \Te*naille"\, n. [F., a pair of pincers or tongs, a
   tenaille, fr. L. tenaculum. See {Tenaculum}.] (Fort.)
   An outwork in the main ditch, in front of the curtain,
   between two bastions. See Illust. of {Ravelin}.