noun
research area; field of research
A broad term for an academic or scientific domain of study. Used in formal and professional contexts.
彼の研究分野は分子生物学です。
His field of research is molecular biology.
この大学には多様な研究分野があります。
This university has diverse research areas.
Compound of 研究 (research) and 分野 (field, area). The components are standard Sino-Japanese words.