Denshi Jisho — Online Japanese dictionary

ウミツバメ storm petrel (any bird of family Hydrobatidae)
Noun, Usually written using kana alone 
ウミテング short dragonfish (Eurypegasus draconis)
Noun, Usually written using kana alone 
ウミヒゴイ yellow striped goatfish (Parupeneus chrysopleuron)
Noun 
ウミヤツメ sea lamprey (Petromyzon marinus)
Noun 
ウムラウト umlaut
Noun, ger: 
ウメモドキ Japanese winterberry; Ilex serrata
Noun, Usually written using kana alone 
うらぶれる to get shabby; to go downhill; to go to seed; to go to the dogs
Ichidan verb, Intransitive verb 
ウリハムシ cucurbit leaf beetle (Aulacophora femoralis)
Noun, Usually written using kana alone 
ウリミバエ melon fly (Bactrocera cucurbitae)
Noun, Usually written using kana alone 
ウルカヌス Vulcan (Roman god) (lat: Vulcanus)
Noun 
ウルティマ Ultima
Noun, Computer terminology 
ウレアーゼ urease
Noun 
うろちょろ loitering; hanging around; wandering around
Noun, Suru verb 
ウロビリン urobilin
Noun 
ウロボロス uroboros; ouroboros (image of a serpent or dragon swallowing its own tail)
Noun 
ウヰスキー whisky; whiskey
Noun 
うんとこさ 1: oof (i.e. a grunt of effort);
2: (Adverb) a lot; plenty
Interjection 
ウンピョウ clouded leopard (Neofelis nebulosa)
Noun, Usually written using kana alone 
ウーファー woofer (speaker system)
Noun 
驢 うさぎうま donkey
Noun 
Υ ウプシロン upsilon
Noun 
υ ウプシロン upsilon
Noun 
釉 うわぐすり glaze; overglaze; enamel
Noun 
蹲る うずくまる to crouch; to squat; to cower
Common word, Godan verb with ru ending, Intransitive verb, Usually written using kana alone 
歌合 うたあわせ poetry contest
Common word, Noun 
裏表 うらおもて 1: both sides;
2: wrong side out; reverse; opposite;
3: double-dealing; two faces (c.f. two-faced)
Common word, Noun 

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