Denshi Jisho — Online Japanese dictionary

コケムシ moss animal (any animal of phylum Bryozoa)
Noun, Usually written using kana alone 
コケモモ cowberry (Vaccinium vitis-idaea); mountain cranberry; foxberry; partridgeberry
Noun, Usually written using kana alone 
ココナツ coconut
Noun 
ココリス coccolith
Noun 
コサイン cosine; cos
Noun 
コサック Cossack
Noun, No-adjective 
コサージ 1: corsage () ; small bouquet worn by a woman;
2: (Archaism) bodice of a woman's dress
Noun 
こじつけ distortion; stretch; strained interpretation; technicality; casuistry; sophistry
Noun, No-adjective 
こせこせ fussy; make a big deal out of nothing
Adverb, Noun, Suru verb, Onomatopoeic or mimetic word 
こそあど Japanese ko-so-a-do demonstratives (e.g. pronouns: kore, sore, are, dore)
Noun, Linguistic term 
こそばい 1: ticklish;
2: embarrassed; awkward; ill at ease (esp. when receiving public praise)
Adjective 
コダシル CODASYL
Noun, Computer terminology 
こだわり 1: obsession; fixation; hangup;
2: determination; fastidiousness; pickiness about (trait, style, etc.)
Noun 
コチコチ 1:
2: (Onomatopoeic or mimetic word) ticktock;
3: (Onomatopoeic or mimetic word) chinking (e.g. of a hammer against rock); knocking; () (Onomatopoeic or mimetic word) dry and hard; (frozen) stiff;
4: (Onomatopoeic or mimetic word) hidebound; die-hard; stubborn; obstinate; bigoted;
5: (Onomatopoeic or mimetic word) scared stiff; tense; nervous; frightened
Adverb taking the 'to' particle, Adverb 
コチドリ little ringed plover (Charadrius dubius)
Noun, Usually written using kana alone 
こっきり just (applies to set number of items, instances, etc.)
Suffix 
こっくり 1: nodding; dozing off;
2: () suddenly
Noun, Suru verb, Adverb taking the 'to' particle 
コッター cotter
Noun 
こっちゃ 1: (as for (that)) thing; (given (that)) thing; matter; fact;
2: (Kansai dialect) (it is a ~) thing; matter; fact
Expression 
こってり 1: thickly; heavily; richly;
2: severely; strongly
Adverb, Adverb taking the 'to' particle, Suru verb 
コッヘル portable stove (outdoor gear) (ger: Kocher)
Noun 
コツコツ 1: (Onomatopoeic or mimetic word) unflaggingly; steadily; untiringly; laboriously;
2: clicking; drumming
Adverb, Adverb taking the 'to' particle 
こつんと with a bump; with a clunk
Adverb 
こてこて 1: (Onomatopoeic or mimetic word) over the top;
2: thickly; heavily; richly
Na-adjective, Suru verb, Adverb 
コテコテ 1: (Onomatopoeic or mimetic word) over the top;
2: thickly; heavily; richly
Na-adjective, Suru verb, Adverb 
コテハン fixed (user) name (usu. with 2ch)
Noun, Colloquialism, Abbreviation 

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