I. hīˈdrȯidə noun plural
Usage: capitalized
Etymology: New Latin, from Hydra, included genus + -oida
: an order of Hydrozoa comprising forms alternating a well-developed asexual polyp generation with a generation of free medusae or of abortive medusoid reproductive structures on the polyps — see leptomedusae
II.
Etymology: New Latin, from Hydra, included genus + -oida
synonym of hydrozoa