Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
filmy is an adjective meaning "so thin as to transmit light". It carries one recorded sense.
so thin as to transmit light
“a hat with a diaphanous veil”
“filmy wings of a moth”
“gauzy clouds of dandelion down”
“gossamer cobwebs”
“sheer silk stockings”
“transparent chiffon”
“vaporous silks”
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 filmy come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.