Last Updated
：2025/12/03
river dolphin
Noun
Japanese Meaning
淡水または汽水域に生息するイルカ。つまり、川や汽水域に特化した生息環境を持ち、分類上はプラタニストオイデア、†リポトオイデア、イニオイデアなどに分けられるイルカ類の総称です。
（ plural ）
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(zoology) Any dolphin that is found only in fresh or brackish water, now considered in one of three superfamilies Platanistoidea, †Lipotoidea, Inioidea, all in parvorder Odontoceti or in a grouping with hippopotamuses.
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river dolphin
After the flood, researchers spotted a river dolphin stranded near the riverbank and hurried to rescue it.
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After the flood, researchers spotted a river dolphin stranded near the riverbank and hurried to rescue it.
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