Definitions

1. adjective

Causing the blood vessels to constrict or reduce in size, or causing the muscles of the eye to constrict and the pupil to become smaller.

“The constringent properties of the tea helped to lower her blood pressure.”

2. noun

A substance that causes the blood vessels to constrict or the muscles of the eye to constrict.

“The constringent in the eye drops helped to dilate her pupils.”