Denshi Jisho — Online Japanese dictionary

精 せい 1: spirit; sprite; nymph;
2: energy; vigor (vigour); strength;
3: fine details;
4: semen
Common word, Noun 
精子 せいし sperm
Common word, Noun, No-adjective 
精度 せいど precision; accuracy
Common word, Noun 
精華 せいか flower; essence; glory
Noun 
精機 せいき precision machinery; precision machine; precision tool; precision tools; precision equipment
Noun 
精気 せいき (mind and) spirit; life energy; vitality; essence
Noun 
精義 せいぎ detailed exposition
Noun 
精査 せいさ close investigation; careful examination; scrutiny
Noun, Suru verb 
精粗 せいそ fineness or coarseness; minuteness or roughness
Noun 
精緻 せいち delicate; minute; subtle
Na-adjective, Noun 
精油 せいゆ 1: essential oil; volatile oil;
2: refined oil
Noun 
精進 そうじ 1: concentration; diligence; devotion;
2: asceticism; zeal in one's quest for enlightenment;
3: adherence to a vegetarian diet
Out-dated or obsolete kana, Noun, Suru verb 
精鋭 せいえい elite; picked; powerful; efficient
Common word, Na-adjective, Noun 
精液 せいえき semen
Common word, Noun, No-adjective 
精巧 せいこう elaborate; delicate; exquisite
Common word, Na-adjective, Noun 
精彩 せいさい brilliance; vividness
Common word, Noun 
精算 せいさん exact calculation; squaring of accounts; adjustment
Common word, Noun, Suru verb 
精神 せいしん mind; soul; heart; spirit; intention
Common word, Noun 
精製 せいせい purification
Common word, Noun, Suru verb, No-adjective 
精選 せいせん careful selection
Common word, Noun, Suru verb, No-adjective 
精々 せいぜい at the most; at best; to the utmost; as much (far) as possible
Common word, Adverb 
精通 せいつう 1: acquaintance; having knowledge; being expert; being versed in; conversant;
2: first ejaculation
Common word, Noun, Suru verb 
精米 せいまい polished rice
Common word, Noun, Suru verb 
精密 せいみつ precise; exact; detailed; minute; close
Common word, Na-adjective, Noun 
精進 しょうじ 1: concentration; diligence; devotion;
2: asceticism; zeal in one's quest for enlightenment;
3: adherence to a vegetarian diet
Out-dated or obsolete kana, Noun, Suru verb 
精一 せいいつ purity
Na-adjective, Noun 
精飲 せいいん semen-drinking
Noun, Suru verb 
精確 せいかく detailed and accurate; exhaustive and precise; meticulous; finely detailed
Na-adjective, Noun 
精悍 せいかん fearless; intrepid
Na-adjective, Noun 

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