sea purse

noun

Definition of sea purse

  1. 1 :  the horny egg case of skates and of some sharks that is usually of quadrangular outline with the angles produced into filaments by which it becomes attached (as to seaweeds) and that commonly contains but one egg or embryo

  2. 2 :  a coenocytic marine green alga of the genus Codium resembling a sponge

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a trip made at another's expense

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