Denshi Jisho — Online Japanese dictionary

いわし pilchard (esp. the Japanese pilchard, Sardinops melanostictus); sardine (esp. the sardine of the Japanese pilchard)
Common word, Noun 
いわしゆ pilchard oil; sardine oil
Noun 
いわしぐも cirro-cumulus; mackerel sky
Noun 
いわしくじら sei whale (Balaenoptera borealis)
Noun, Usually written using kana alone 

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