Noun:

1. small genus of perennial herbs having rhizomes and palmate leaves and small solitary flowers; of northeastern United States and Japan

hydral水合氯醛hydran.（希腊神话中的）九头蛇；难以根除之祸害；水螅Hydra.n.长蛇星座hydration reactor水合反应器hydrazo-benzene[化] 1,2-亚肼基苯; 二苯肼Hydrangea anomalan.冠盖绣球hydratroponitrile氢化阿托腈hydradisc refiner液压控制单动盘磨机hydrazine nitrate硝酸肼hydration hydrate水合肼hydration product水化产物Hydrangea gracilisn.细枝绣球hydrazino-boranen.肼基硼烷