Denshi Jisho — Online Japanese dictionary

つ 1: indicates two contrasting actions;
2: (Particle) (Archaism) indicates possessive (often found in place names and compound words)
Conjunction 
個 つ counter for the hito-futa-mi counting system (forming hitotsu, futatsu, mitsu, and misoji, yasoji, etc.)
Counter, Usually written using kana alone 
唾 つ saliva; spit; sputum
Out-dated or obsolete kana, Noun, Suru verb 
津 つ 1: harbour; harbor; port;
2: ferry
Suffix 
箇 つ counter for the hito-futa-mi counting system (forming hitotsu, futatsu, mitsu, and misoji, yasoji, etc.)
Counter, Usually written using kana alone 
つい 1: just (now);
2: quite (near);
3: unintentionally; unconsciously; by mistake; against one's better judgement (judgment)
Common word, Adverb 
つつ 1: while;
2: even though; despite
Common word, Particle 
ツナ tuna (usu. refers to canned tuna)
Common word, Noun 
ツキ Japanese zelkova (species of elm-like tree, Zelkowa serrata)
Noun, Usually written using kana alone 
ツキ 1: furnished with; including;
2: attached to;
3: impression; appearance;
4: (Noun)
5: (Usually written using kana alone) luck;
6: sociality; () under; assistant (e.g. to a manager);
7: soup base
Noun, Noun suffix 
ツゲ Japanese box tree (Buxus microphylla var. japonica); Japanese boxwood
Noun, Usually written using kana alone 
つと 1: quickly;
2: calmly;
3: intently
Adverb 
ツブ 1: (Usually written using kana alone) whelk (esp. Neptunea and Buccinum spp.);
2: small spiral-shelled snail (esp. a pond snail)
Noun 
ツミ Japanese sparrowhawk (Accipiter gularis)
Noun, Usually written using kana alone 
ツメ to close up (editing mark)
Noun, Abbreviation 
ツル crane (any bird of the family Gruidae, esp. the red-crowned crane, Grus japonensis)
Noun 
ツー two
Noun 
対 つい 1: pair; couple; set;
2: antithesis;
3: (Counter) counter for items that come in pairs;
4: counter for sets (of clothes, small furniture, utensils, etc.)
Common word, Noun 
通 つう 1: connoisseur; authority;
2: (Counter) counter for letters, notes, documents, etc.
Common word, Na-adjective, Noun 
杖 つえ cane; walking stick; staff
Common word, Noun 
塚 つか mound
Common word, Noun 
月 つき 1: moon;
2: (Temporal noun) month
Common word, Noun 
次 つぎ 1: next; following; subsequent;
2: stage; station
Common word, Noun, No-adjective 
辻 つじ intersection; crossing; crossroad; street corner; street
Common word, Noun, Noun or verb acting prenominally 
土 つち 1: earth; soil; dirt;
2: the earth (historically, esp. as opposed to the heavens); the ground; the land;
3: low-quality torinoko-gami (containing mud);
4: (period of) refraining from construction in the direction of the god of the earth (in On'youdou)
Common word, Noun 
筒 つつ 1: pipe; tube; cylinder;
2: gun barrel;
3: gun
Common word, Noun 

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