say it: an-uh-fuh-LAK-sis
anaphylaxis is a noun meaning "hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance". It carries one recorded sense.
hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance
drug
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 anaphylaxis come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.