ocean sunfish; Mola mola
Refers to the large, oddly-shaped ocean sunfish. Usually written in katakana.
I saw a big ocean sunfish at the aquarium.
Katakana spelling is the most common written form for this word.
Hiragana spelling is also used.
Kanji spelling is rare and mainly encountered in specialized contexts.
The origin is uncertain. The reading まんぼう may be related to the fish's round shape, but the exact derivation is unclear.