18-Syllable Words in English (US)
Explore English (US) words that divide into exactly 18 syllables, complete with pronunciations, syllable breakdowns, and linguistic insights.
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The word is a multi-root compound with morpheme-aligned syllabification. Syllable breaks follow legal onset rules, with primary stress on the penultimate -no- of the final -nosis segment and secondary stresses on major combining forms.
Pneumonoultramicroscopicsilicovolcanoconiosis is an 18-syllable medical compound (pneu-mo-no-ul-tra-mi-cro-scop-ic-sil-i-co-vol-ca-no-co-no-sis) meaning a lung disease from inhaling fine volcanic silica dust. Built from Greek/Latin combining forms: pneumono- (lung) + ultramicroscopic + silico- (silica) + volcano- + -coniosis (dust disease). Primary stress on penultimate syllable with multiple secondary stresses. Syllabification follows Maximal Onset Principle while respecting morpheme boundaries and preserving the Greek 'pn' cluster.