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There are 2 thirteen-letter words beginning with SIPHONOS

SIPHONOSTELES	• siphonosteles n. Plural of siphonostele. • SIPHONOSTELE n. the cylinder of conducting tissue surrounding a central core of pith in certain stems.
SIPHONOSTELIC	• siphonostelic adj. Relating to a siphonostele. • SIPHONOSTELIC adj. of or like a siphonostele, the cylinder of conducting tissue surrounding a central core of pith in certain stems.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 3 words
Scrabble in French: no word
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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