ˌhaləˈmēdə noun
Usage: capitalized
Etymology: New Latin, after Halimede, a nereid, from Greek Halimēdē
: a genus (family Codiaceae) of calcareous marine green algae remarkable for the jointed coenocytic thallus which in most of the species (as H. tuna ) resembles a prickly-pear cactus in miniature