The Collaborative International Dictionary of English v.0.48:
Decacerata \De*cac`e*ra"ta\, n. pl. [NL., fr. Gr. de`ka ten + ke`ras a horn.] (Zool.) The division of Cephalopoda which includes the squids, cuttlefishes, and others having ten arms or tentacles; -- called also Decapoda. [Written also Decacera.] See Dibranchiata. Decachord