“Sea cow” in Japanese
Short answer
Sea cow in Japanese is “海牛” (umiushi). Full meaning: sirenian (any aquatic mammal of order Sirenia, incl. manatees, and dugongs), sea cow; sea slug (various orthogastropod species, esp. of order Nudibranchia), nudibranch.
Other ways to say “Sea cow” in Japanese
ウミウシ
umiushi sirenian (any aquatic mammal of order Sirenia, incl. manatees, and dugongs), sea cow; sea slug (various orthogastropod species, esp. of order Nudibranchia), nudibranch
うみうし
umiushi sirenian (any aquatic mammal of order Sirenia, incl. manatees, and dugongs), sea cow; sea slug (various orthogastropod species, esp. of order Nudibranchia), nudibranch
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