Denshi Jisho — Online Japanese dictionary

疎か おろそか neglect; negligence; carelessness
Common word, Na-adjective, Noun 
終値 おわりね closing price (stock exchange, etc.)
Common word, Noun 
音階 おんかい musical scale
Common word, Noun, No-adjective 
音楽 おんがく music; musical movement
Common word, Noun 
音訓 おんくん kanji readings
Common word, Noun 
恩恵 おんけい grace; favor; favour; blessing; benefit
Common word, Noun 
穏健 おんけん quiet; dependable; uniform; (politically) moderate
Common word, Na-adjective, Noun 
温厚 おんこう gentle
Common word, Na-adjective, Noun 
温室 おんしつ greenhouse; hothouse; conservatory; glasshouse
Common word, Noun 
音質 おんしつ tone quality; sound quality
Common word, Noun 
恩赦 おんしゃ amnesty; pardon
Common word, Noun 
恩人 おんじん benefactor; patron
Common word, Noun 
音声 おんせい voice; (the concept of) sound
Common word, Noun 
温泉 おんせん spa; hot spring; onsen
Common word, Noun 
温存 おんぞん preserve; retain
Common word, Noun, Suru verb 
温帯 おんたい temperate zone
Common word, Noun 
温暖 おんだん warmth
Common word, Na-adjective, Noun 
音程 おんてい musical interval; step
Common word, Noun 
穏当 おんとう proper; reasonable; right
Common word, Na-adjective, Noun 
音読 おんどく 1: reading aloud;
2: on'yomi (adopted Chinese reading of a kanji)
Common word, Noun, Suru verb 
穏便 おんびん gentle; peaceable; quiet
Common word, Na-adjective, Noun 
追々 おいおい gradually; by degrees; little by little; step by step
Adverb 
追追 おいおい gradually; by degrees; little by little; step by step
Adverb 
追風 おいかぜ tailwind; fair or favorable wind (favourable)
Noun 
負革 おいかわ sling (e.g. of a firearm)
Noun 
追河 おいかわ freshwater minnow; pale chub (Zacco platypus)
Noun, Usually written using kana alone 

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