单词	hydroid
释义	hydroid /ˈhʌɪdrɔɪd / Zoology noun A coelenterate of an order which includes the hydras. They are distinguished by the dominance of the polyp phase. Order Hydroida, class Hydrozoa. Aside from its temporary and permanently resident fish, the underside is decorated with sponges, hydroids, tunicates, tube worms, cup corals and anemones.... There were dense walls of soft corals, sponges, anemones and hydroids, nudibranchs, creepy-crawlies and lots of fish. On the walls are a riot of soft corals, sponges, hydroids and anemones in all shapes and sizes. adjective 1Relating to coelenterates of the hydroid group.He had shown that hydroid jellyfish known as naked-eyed medusae reproduce not only by spewing eggs, but also by asexual budding, which he found marvelous to behold.... The hydroid tissues, in particular, are the general run of moss water storage cells and are probably only remotely related to the xylem of tracheophytes. Before long, similar green proteins were detected in many bioluminescent coelenterates including various medusae, apparently all luminescent hydroid polyps, and a few others. 1.1 another term for polypoid (sense 1). Origin Mid 19th century: from hydra + -oid.
随便看	arterious arteriovenous arteriovenous anastomosis arteritic arteritis artery artery-clogging artesian artesian basin artesian bore artesian water artesian well Artex art film art-for-arter art for art's sake art-for-art's-saker art form artful artfully artfulness art gallery art gum art historian art historical

英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。