tetrasyllable

/tษ›tษนษ™หˆsษชlษ™bl/

IPA: /T EH0 T R AH0 S IH1 L AH0 B AH0 L/

noun
  1. 1

    (also used attributively) A word comprising four syllables.

Source: https://en.wiktionary.org/wiki/tetrasyllable