Denshi Jisho — Online Japanese dictionary

稀 まれ rare; seldom
Common word, Na-adjective, Usually written using kana alone 
稀土 きど rare earth
Out-dated kanji, Noun 
稀有 けう rare; uncommon
Na-adjective, Noun 
疎ら まばら sparse; thin; scattered; straggling; sporadic
Common word, Na-adjective, Noun 
稀酸 きさん dilute acid
Noun 
稀書 きしょ rare book
Noun 
稀世 きせい rare; uncommon
Noun 
稀代 きたい rarity; uncommonness
Noun, No-adjective 
稀代 きだい rarity; uncommonness
Noun, No-adjective 
稀薄 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 
稀ガス きガス noble gas
Noun 
稀釈 きしゃく dilution
Noun, Suru verb 
稀少 きしょう scarce; rare
Na-adjective, Noun 
稀元素 きげんそ rare element
Noun 
稀塩酸 きえんさん dilute hydrochloric acid
Noun 
稀覯本 きこうぼん rare book
Noun 
稀崩壊 きほうかい rare decay (particle physics)
Noun 
稀に見る まれにみる rare; extraordinary; singular
Expression, Noun or verb acting prenominally 
稀硫酸 きりゅうさん dilute sulfuric acid; dilute sulphuric acid
Noun 

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