Wa·ter deer Zool. (a) A small Chinese deer (Hydropotes inermis). Both sexes are destitute of antlers, but the male has large, descending canine tusks.  (b) The water chevrotain.
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  water deer
       n : largest chevrotain; of marshy areas of west Africa [syn: water
           chevrotain, Hyemoschus aquaticus]