Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
pinworm is a noun meaning "small threadlike worm infesting human intestines and rectum especially in children". It carries one recorded sense.
small threadlike worm infesting human intestines and rectum especially in children
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 pinworm come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.