IPA: //ˌvæsəˈprɛsɪn//
KK: /ˌvæsəˈprɛsɪn/
A hormone produced by the pituitary gland that helps control blood pressure and reduces the amount of urine the body makes.
Doctors may use vasopressin to treat certain conditions related to low blood pressure.
Vasopressin is formed from "vaso-" (from Latin "vas" meaning vessel) and "pressin" (derived from the Greek "pressin" meaning to press). The term refers to a hormone that constricts blood vessels, thereby increasing blood pressure.
Think of 'vessel' ('vaso-') being 'pressed' ('pressin') to remember that vasopressin is a hormone that helps constrict blood vessels and raise blood pressure.
No commonly confused words.