Definition

Noun: 1. The egg case of certain sharks and rays: A "sea-purse" is the tough, protective, leathery capsule that contains the fertilized eggs of some cartilaginous fish, like dogfish sharks, skates, and rays. These cases are often found washed up on beaches.

Usage Notes

• The term "sea-purse" is a common name, not a formal scientific term. It is used descriptively because the object's shape and texture can resemble a small, weathered purse or wallet.
• It is a compound noun, but its meaning is specific and idiomatic, referring to the natural object itself.
• It is typically used in singular form when referring to a single egg case.

Examples

• Noun:
  • While walking along the beach, the children found a black, empty sea-purse among the seaweed.
  • Biologists study the shape of the sea-purse to identify which species of skate laid it.

Advanced Usage

• The term is often used in marine biology contexts, environmental education, and by beachcombers.
• It can be part of descriptive phrases like "mermaid's purse," which is a more common synonym.

Variants and Related Words

• Mermaid's purse: A more common and poetic synonym for "sea-purse."
• Egg case: The general biological term for such a structure.
• Skate egg case: A more specific term when the origin is known.

Synonyms

• Mermaid's purse
• Egg case (of a shark, skate, or ray)

Notes on Different Meanings

• The provided reference context ("the seaward undercurrent...") is incorrect for the term "sea-purse." That definition describes a rip current or undertow. "Sea-purse" does not have this meaning in standard or common usage. The correct definition is the egg case of certain fish.

Noun

1. the seaward undercurrent created after waves have broken on the shore