Denshi Jisho — Online Japanese dictionary

ウダイカンバ monarch birch (Betula maximowicziana); Japanese birch
Noun, Usually written using kana alone 
ウチナーグチ words and phrases only used in Okinawa; Okinawa dialect
Noun, Usually written using kana alone 
うちわやんま Sinictinogomphus clavatus (species of clubtail dragonfly)
Noun, Usually written using kana alone 
ウチワヤンマ Sinictinogomphus clavatus (species of clubtail dragonfly)
Noun, Usually written using kana alone 
うっかりミス honest mistake
Noun 
うっとりする 1: to be entranced; to be enraptured; to be transported; to be fascinated;
2: to be absentminded; to be miles away; to be in a world of one's own
Expression, Suru verb - irregular 
ウッドチップ woodchip
Noun 
ウッドパルプ woodpulp
Noun 
ウッドメタル Wood's metal
Noun 
うつらうつら drowsily; nodding off
Adverb 
ウミイグアナ marine iguana (Amblyrhynchus cristatus)
Noun, Usually written using kana alone 
ウミザリガニ lobster
Noun, Usually written using kana alone, Obscure term 
ウミタケガイ dilate piddock (Barnea dilatata)
Noun, Usually written using kana alone 
ウメバチソウ marsh grass of Parnassus (Parnassia palustris)
Noun, Usually written using kana alone 
ウラウズガイ Astralium haematragum (species of turban shell)
Noun, Usually written using kana alone 
ウラシマソウ Arisaema urashima (species of cobra lily)
Noun, Usually written using kana alone 
ウラジロノキ fern with white-backed leaves; sorbus japonica
Noun 
ウランガラス uranium glass
Noun 
ウルシオール urushiol
Noun 
ウルメイワシ round herring (Etrumeus teres)
Noun, Usually written using kana alone 
ウレタンゴム polyurethane rubber (ger: Urethan, dut: gom)
Noun, Abbreviation 
ウロキナーゼ urokinase
Noun 
ウワバミソウ Elatostema umbellatum var. majus (variety of plant related to the nettles)
Noun, Usually written using kana alone 
うんしょっと omigosh; crikey
Interjection 
ウンディーネ undine
Noun 
うんとこしょ 1: oof (i.e. a grunt of effort);
2: (Adverb) a lot; plenty
Interjection 

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