Denshi Jisho — Online Japanese dictionary

オニグモ Araneus ventricosus (species of orb-weaving spider)
Noun, Usually written using kana alone 
おねんね bed-time (for a baby); going bye-byes
Noun, Suru verb 
おばはん 1: (Kansai dialect) aunt;
2: middle-aged lady
Noun, Na-adjective 
オパール opal
Noun, fre: 
オヒシバ Indian goosegrass (Eleusine indica)
Noun, Usually written using kana alone 
オヒョウ halibut (esp. the Pacific halibut, Hippoglossus stenolepis)
Noun, Usually written using kana alone 
オヒョウ Manchurian elm (Ulmus laciniata)
Noun, ain: 
オヒルギ black mangrove (Bruguiera gymnorrhiza)
Noun, Usually written using kana alone 
オピウム opium
Noun 
オファー offer
Noun, Suru verb 
オフコン office computer
Noun, Computer terminology, Abbreviation 
おべっか flattery
Noun 
オペコド opcode
Noun, Computer terminology 
オペック Organization of Petroleum Exporting Countries (Organisation); OPEC
Noun 
オペロン operon
Noun 
オペーク opaque
Noun 
おまんこ 1:
2: (Rude or X-rated term) (Colloquialism) vagina; (Suru verb) to have sexual intercourse; to screw
Noun 
オマール lobster (fre: homard)
Noun 
オマーン Oman
Noun 
オミット 1: exception; exclusion;
2: (Suru verb) to omit; to disallow (e.g. in a sport after a rule is broken); to reject (e.g. faulty product); to eject; to expel; to throw out
Noun 
おめおめ 1: (Onomatopoeic or mimetic word) shamelessly; acting brazenly unaffected;
2: being resigned to (disgrace)
Adverb taking the 'to' particle 
おめかし dressing up
Noun, Suru verb 
おめでた matter for congratulation (wedding, pregnancy, birth, etc.); happy event
Noun 
おもしい interesting (Kanazawa dialect); amusing
Adjective 
オモダカ threeleaf arrowhead (Sagittaria trifolia)
Noun, Usually written using kana alone 
おもろい interesting; amusing
Adjective, Kansai dialect 

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