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There are 3 twelve-letter words beginning with SIP

SIPHONOPHOREsiphonophore n. (Zoology) Any of various transparent marine hydrozoans, of the order Siphonophorae, that float or swim…
SIPHONOPHORE n. a marine creature, colonial in habit.
SIPHONOSTELEsiphonostele n. (Botany) A type of stele in which the vascular tissue in the stem forms a cylinder surrounding a central…
SIPHONOSTELE n. the cylinder of conducting tissue surrounding a central core of pith in certain stems.
SIPUNCULOIDSsipunculoids n. Plural of sipunculoid.
SIPUNCULOID n. a kind of marine worm with a retractile proboscis, also SIPUNCULID.

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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See this list for:

  • English Wiktionary: 12 words
  • Scrabble in French: 13 words
  • Scrabble in Spanish: 1 word
  • Scrabble in Italian: no word
  • Scrabble in German: no word
  • Scrabble in Romanian: 3 words


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