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septisyllable
septisyllable n. 
/ˈsɛptᵻˌsɪləbl/,
Brit. /ˌsɛptᵻˈsɪləbl/
, /ˌsɛptᵻˈsɪləbl//ˈsɛptᵻˌsɪləbl/U.S. /ˌsɛptəˈsɪləb(ə)l/
a word of seven syllables. [Compare heptasyllable n. at heptasyllabic adj. and n. Derivatives.] /ˌsɛptəˈsɪləb(ə)l/ΘΚΠ
the mind > language > linguistics > study of speech sound > speech sound > [noun] > syllabic sound > syllable > word having specific number
bissyllable1589
disyllable1589
tetrasyllable1589
trisyllable1589
quadrisyllable1706
pentasyllable1709
quadrisyllabic1776
septisyllable1834
octosyllable1846
sexisyllable1855
disyllabic1934
paralog1951
1834 J. Oswald Etymol. Dict. Eng. Lang. 262 Septisyllable.
1997 Papers & Stud. in Contrastive Linguistics 32 131 He proceeds to discuss the stress pattern of longer words (including trisyllables, quadrisyllables, quintisyllables, sexsyllables and septisyllables).
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