Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
demagnetize is a verb meaning "erase (a magnetic storage device)". It carries 2 recorded senses.
erase (a magnetic storage device)
make nonmagnetic; take away the magnetic properties (of)
“demagnetize the iron shavings”
“they degaussed the ship”
physics
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 demagnetize come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.