Webster's English Dictionary

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elasmobranch

elas.mo.branch \i-'laz-m*-.brank\ aj [deriv. of Gk elasmos metal plate (fr. 
   elaunein) + L branchia] gill : of or relating to a class (Chondrichthyes) 
   of fishes having lamellate g ills and comprising the sharks, rays, 
   chimaeras, and various extinct related fishes - elasmobranch n