IPA: /ˌɛkstrævəˈseɪʃən/
KK: /ɛkˌstrævəˈseɪʃən/
The process of a liquid, such as blood or lymph, leaking out from a vessel into surrounding tissues.
The doctor explained that extravasation can occur if a vein is damaged during an injection.
Extravasation → It is formed from "extra-" (meaning outside) and "vasare" (meaning to put in a vessel). The word describes the process of a substance flowing out of its vessel, particularly in a medical context where fluids leak out of blood vessels into surrounding tissues.
Think of something flowing 'outside' ('extra-') of its 'vessel' ('vasare') — that's why extravasation refers to fluid leaking out of its container.