究: investigate

究 jīu

: after all
: to investigate; to study carefully

Kun Reading

究める | きわめる kiwameru

ichidan verb | transitive verb
: to carry to extremes; to go to the end of something
: to investigate thoroughly; to master

極まる OR 窮まる | きわまる kiwamaru

godan verb with ru ending | intransitive verb
: to terminate; to reach an extreme; to take to the extreme; to be in a dilemma; to be at an end

究竟 jiu1jing4: to go to the bottom of a matter; after all; when all is said and done; (in an interrogative sentence) finally; outcome; result
[くきょう kukyou OR くっきょう kukkyou OR きゅうきょう kyuukyou: culmination; conclusion]

究办 jiu1ban4: to investigate and deal with

追究 zhui1iu1: to investigate; to look into
[ついきゅう tsuikyuu: investigation (e.g. academically, of the unknown); enquiry; inquiry]

终究 zhong1iu1: in the end; after all is said and done

探究 tan4iu1: to investigate; to delve; to probe; to inquire into; to look into
[たんきゅう tankyuu: search; research; enquiry; inquiry]

学究 xue2iu1: pedant [がっきゅう gakkyuu: scholar; student]

研究 yan2jiu1: research; a study [けんきゅう kenkyuu: study; research; investigation]

研究所 yan2jiu1 suo3: research institute; graduate studies; graduate school
[けんきゅうしょ kenkyuusho OR けんきゅうじょ kenkyuujo: research establishment (institute, laboratory, etc.)]  
研究生 yan2jiu1 sheng1: graduate student; postgraduate student; research student
[けんきゅうせい kenkyuusei: research student] [研究家 | けんきゅうか kenkyuuka: researcher; student (of)]

Japanese common word | expression | yojijukugo 四字熟語 | idiom
真相究明 | しんそうきゅうめい shinsou kyuumei
: (yoji) probe into the truth (of the matter); dig into the real facts of the case; get at the root of a matter

Chinese expression | chengyu 成語 | idiom
究其根源 jiu1 qi2 gen1 yuan2
: to trace something to its source

究其原因 jiu1 qi2 yuan2yin1
: according to research

盤根究底 [盘根究底] pan2 gen1 jiu1 di3
: lit. to examine roots and inquire at the base; to get to the bottom of something

追根究底 zhui1 gen1 jiu1 di3
: to get to the heart of the matter