やこう
nocturnal luminescence; noctilucence
・night
・evening
・ray
・light
やこうとりょう
luminous paint
やこうどけい
luminous watch;luminous clock
やこうちゅう
Noctiluca scintillans (luminescent species of dinoflagellate)
やこうがい
great green turban (Turbo marmoratus)
やこううん
noctilucent clouds