Jisho

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Noun
1. swim bladder; air bladderSee also 浮き袋
Wikipedia definition
2. Swim bladderThe swim bladder, gas bladder, fish maw or air bladder is an internal gas-filled organ that contributes to the ability of a fish to control its buoyancy, and thus to stay at the current water depth without having to waste energy in swimming. The swim bladder is also of use as a stabilizing agent because in the upright position the center of mass is below the center of volume due to the dorsal position of the swim bladder.
Read “Swim bladder” on English Wikipedia
Read “鰾” on Japanese Wikipedia
Read “Swim bladder” on DBpedia
Other forms
鰾 【うきぶくろ】鰾 【ひょう】鰾 【ほばら】鰾 【ほはら】
Notes
うきぶくろ: Gikun (meaning as reading) or jukujikun (special kanji reading). ほばら: Out-dated or obsolete kana usage. ほはら: Out-dated or obsolete kana usage.

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