the.com/nurse shark

means A large, slow-moving, bottom-dwelling shark that uses suction to slurp up prey like crustaceans and small fish from the seafloor, generally docile toward humans.

from The 'shark' part comes from a word of uncertain origin that surfaced in English in the 1500s, possibly borrowed from German Schurke ('scoundrel'). The 'nurse' part is the puzzle: it's likely a worn-down version of an older fish name. One leading idea traces it to 'nusse,' an old term for a catshark or dogfish; another points to the Old French 'huss' (dogfish), which may have picked up an 'n' over time the way 'an ewt' became 'a newt.' So despite the cozy bedside image, the name probably has nothing to do with nursing — it's an accident of mishearing centuries old.