Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
extravasation is a noun meaning "an extravasated liquid (blood or lymph or urine); the product of extravasation". It carries 3 recorded senses.
an extravasated liquid (blood or lymph or urine); the product of extravasation
(of volcanos) pouring out fumes or lava (or a deposit so formed)
vent
the process of exuding or passing out of a vessel into surrounding tissues; said of blood or lymph or urine
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 extravasation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.