Webster's English Dictionary

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ganoid

gan.oid \'gan-.o.id\ \ga-'no.id-e--*n\ aj [deriv. of Gk ganos brightness; 
   akin to Gk ge-thein to rejoice -m more at JOY : of or relating to a 
   subclass (Ganoidei) of living and extinct teleost f ishes (as the 
   sturgeons) with usu. hard rhombic enameled scales - ganoid n