Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
cephalalgia is a noun meaning "pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs". It carries one recorded sense.
pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs
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 cephalalgia come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.