Definition

Noun: 1. A tough, protective case for the eggs of certain fish, especially sharks and rays: A "sea purse" is the common name for the egg case of elasmobranch fish (sharks, skates, rays, and chimaeras). It is a leathery, often rectangular or spiral-shaped capsule that protects the developing embryo. These cases are frequently found washed up on beaches. 2. (Less common) A figurative term for the ocean as a source of treasure or abundance: This is a poetic or literary usage, referring to the sea as a holder of valuable things.

Usage Examples

• Noun (Egg Case):
  • The children found a dried-out sea purse on the beach and learned it was a skate egg case.
  • Biologists study the shape and size of the sea purse to identify the species of shark that laid it.
• Noun (Poetic):
  • The old sailor spoke of the ocean as a sea purse, forever hiding its deepest secrets and riches. (This usage is rare and stylistic.)

Advanced Usage

• The term is primarily used in marine biology and by beachcombers. In scientific contexts, the more precise terms "egg case," "mermaid's purse," or "devil's purse" are often used interchangeably with "sea purse."

Variants and Related Words

• Mermaid's Purse: A very common synonym for "sea purse," especially for the egg cases of skates and rays.
• Devil's Purse: Another synonym for a shark or ray egg case.
• Egg Case: The general biological term.
• Beachcomber: A person who searches beaches for interesting items, such as sea purses.

Synonyms

• Egg case
• Mermaid's purse
• Devil's purse
• Egg capsule (biological term)

Notes on Different Meanings

• The primary, concrete meaning (the egg case) is standard and widely understood in coastal regions.
• The secondary, poetic meaning (the sea as a purse) is archaic and would likely only be encountered in literary works or metaphorical speech. It should not be confused with the common biological term.

Noun

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