Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ecchymosis is a noun meaning "the purple or black-and-blue area resulting from a bruise". It carries 2 recorded senses.
the purple or black-and-blue area resulting from a bruise
the escape of blood from ruptured blood vessels into the surrounding tissue to form a purple or black-and-blue spot on the skin
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for ecchymosis come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.