IPA: /ˌɛkɪˈmoʊsɪs/
KK: /ˌɛkɪˈmoʊsɪs/
A condition where blood leaks from damaged blood vessels into the skin or tissues, causing a purple or blue discoloration.
After the fall, she had a large ecchymosis on her arm that took weeks to heal.
Ecchymosis is formed from "ek-" (meaning out) and "chymos" (meaning juice or fluid). The term describes the condition where blood seeps out of vessels into the surrounding tissue, resulting in a bruise, which can be visualized as fluid coming out from the blood vessels.
Think of blood 'seeping out' ('ek-') as a 'fluid' ('chymos') that causes discoloration on the skin, which is what ecchymosis refers to.
No commonly confused words.