The answer is:
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Decider (n.) — One who decides.
Deca- () — A prefix, from Gr. de`ka, signifying ten; specifically (Metric System), a prefix signifying the weight or measure that is ten times the principal unit.
Decacerata (n. pl.) — 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 (n.) — Alt. of Decachordon
Decachordon (n.) — An ancient Greek musical instrument of ten strings, resembling the harp.