noun
A person who investigates or researches something, often with a nuance of deep inquiry or exploration. Used in academic, scientific, or detective contexts.
彼は宇宙の謎を解き明かす探究者だ。
He is an investigator who unravels the mysteries of the universe.
その歴史家は古文書の熱心な探究
The historian is known as a dedicated researcher of ancient documents.
Compound of 探究 (たんきゅう, 'inquiry, investigation') + 者 (しゃ, 'person'). The exact historical derivation is uncertain, but the components are transparent.