体内(たいない)

Composed of 体(たい) (body) + 内(ない) (inside). Functions primarily as a noun modifier with の: 体内(たいない)の～ (something inside the body).

Usage

Common in medical, health, and scientific contexts. Less common in casual conversation.

Common collocations

• 体内(たいない)時計(どけい): biological clock
• 体内(たいない)に取(と)り込(こ)む: to take into the body
• 体内(たいない)の水分(すいぶん): moisture in the body
• 体内(たいない)に蓄積(ちくせき)する: to accumulate in the body
• 体内(たいない)環境(かんきょう): internal body environment

Similar words

• 体内(たいない): inside the body
• 体外(たいがい): outside the body (e.g., 体外(たいがい)受精(じゅせい) = in vitro fertilization)