Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
mailing-card is a noun meaning "a card for sending messages by post without an envelope". It carries one recorded sense.
a card for sending messages by post without an envelope
Definitions, synonyms and semantic relations for mailing-card come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.