also: ないぶんぴつ
noun-modifying (irregular)
endocrine; internal secretion
Refers to the system of glands that secrete hormones directly into the bloodstream. Used both as a noun and as a prenominal modifier (e.g., 内分泌系, 内分泌腺). The term 'incretion' is an older medical synonym for internal secretion.
内分泌系はホルモンを分泌する器官の集まりです。
The endocrine system is a collection of organs that secrete hormones.
The thyroid gland is one of the endocrine glands.