Denshi Jisho — Online Japanese dictionary

まれ rare; seldom
Common word, Na-adjective, Usually written using kana alone 
きど rare earth
Out-dated kanji, Noun 
けう rare; uncommon
Na-adjective, Noun 
きさん dilute acid
Noun 
きしょ rare book
Noun 
きせい rare; uncommon
Noun 
きたい rarity; uncommonness
Noun, No-adjective 
きだい rarity; uncommonness
Noun, No-adjective 
きはく 1: thin (e.g. air); diluted; sparse; lean; weak; rarified; rarefied;
2: lacking (e.g. empathy); deficient; insufficient (e.g. zeal)
Na-adjective, Noun 
ガス きガス noble gas
Noun 
きしゃく dilution
Noun, Suru verb 
きしょう scarce; rare
Na-adjective, Noun 
元素 きげんそ rare element
Noun 
塩酸 きえんさん dilute hydrochloric acid
Noun 
覯本 きこうぼん rare book
Noun 
崩壊 きほうかい rare decay (particle physics)
Noun 
に見る まれにみる rare; extraordinary; singular
Expression, Noun or verb acting prenominally 
硫酸 きりゅうさん dilute sulfuric acid; dilute sulphuric acid
Noun 

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