# sleeper shark

> English word · Noun

## Definitions
1. Any shark of the family Somniosidae.

## Etymology
Calque of translingual Somniosus (literally “sleepy”). From sleeper + shark, referring to their slow, lethargic habits.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/sleeper-shark