hae·ma·to·bran·chia \ˌhēməd.ōˈbraŋkēə, ˌhem-\noun plural Usage: capitalized Etymology: New Latin, from hemat- + -branchia in some classifications: a division of arthropods consisting of the trilobites, eurypterids, and king crabs • haem·a·to·branch·i·ate\| ̷ ̷ ̷ ̷ ̷ ̷|braŋkēə̇t, -ēˌāt\adjective