multisyllable

[muhl-ti-sil-uh-buh l]

noun

Origin of multisyllable

First recorded in 1960–65; multi- + syllable

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Did you have the impression he searched for the multisyllable word?
Warren Commission (11 of 26): Hearings Vol. XI (of 15)
The President's Commission on the Assassination of President Kennedy
Multisyllable, mul-ti-sil′a-bl, n. a word of many syllables.
Chambers's Twentieth Century Dictionary (part 2 of 4: E-M)
Various