hydra
Any of several small freshwater polyps of the genus Hydra and related genera, having a naked cylindrical body and an oral opening surrounded by tentacles.
(obsolete) Synonym of undern: originally terce and the morning, later (UK dialect obsolete) noon and the early afternoon.
(countable) A body of words, and set of methods of combining them (called a grammar), understood by a community and used as a form of communication.
Failure to remunerate; absence of remuneration.
実験の授業中、顕微鏡で水中の葉にしがみつくヒドラを観察した。
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