Zoology 【动】
1
- a coelenterate of an order which includes the hydras. They are distinguished by the dominance of the polyp phase水螅类生物(包括水螅, 以水螅型占优势为特点)。
1.1
- Order Hydroida, class Hydrozoa.水螅虫目, 水螅虫纲。
词源
mid 19th cent.: from HYDRA+ -OID.