What is "sea-purse"

Etymology 1 n. 1 The egg case of skate, shark or ratfish; a mermaid's purse. 2 The sea bean (taxlink Dioclea reflexa species noshow=1). Etymology 2

n. (context rare English) (alternative form of sea puss English)

n. the seaward undercurrent created after waves have broken on the shore [syn: undertow, sea puss, sea-puss, sea purse, sea-poose]