What defines a "multisyllabic" word?

A "multisyllabic" word is defined by having at least two syllables. Syllables are units of pronunciation that typically contain a vowel sound and can include surrounding consonants. For example, the word "butter" has two syllables: "but" and "ter." The presence of two or more syllables is what categorizes a word as multisyllabic, making this definition crucial for understanding word structure and pronunciation.

Other options do not accurately describe what makes a word multisyllabic. For instance, a word being difficult to pronounce does not necessarily mean it has multiple syllables, as pronunciation can vary widely. Rhyming pertains to the sound of words at the end rather than the number of syllables, and a word being infrequent in use does not imply anything about its syllable count. Thus, the defining characteristic of a multisyllabic word is indeed its syllable count, specifically having two or more.