Source : Webster's Revised Unabridged Dictionary (1913)

Tectibranchiate \Tec`ti*bran"chi*ate\, a. [L. tectus (p. p. of
   tegere to cover) + E. branchiate.] (Zo["o]l.)
   Having the gills covered by the mantle; of or pertaining to
   the Tectibranchiata. -- n. A tectibranchiate mollusk.