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There are 7 twelve-letter words beginning with OCTA

OCTAHEDRALLY	• octahedrally adv. In an octahedral manner. • OCTAHEDRAL adv. having eight faces or sides.
OCTAHEDRITES	• OCTAHEDRITE n. a variety of anatase, crystallising in square bipyramids.
OCTAPEPTIDES	• octapeptides n. Plural of octapeptide. • OCTAPEPTIDE n. a protein fragment or molecule that consists of eight amino acids linked in a polypeptide chain.
OCTAPLOIDIES	• OCTAPLOIDY n. the condition of being octaploid, eightfold.
OCTASTICHONS	• OCTASTICHON n. a poem or stanza of eight lines, also OCTASTICH.
OCTASTICHOUS	• octastichous adj. (Botany) Having a phyllotaxis of eight leaves in each spiral around a stem. • OCTASTICHOUS adj. in eight rows, also OCTOSTICHOUS.
OCTASTROPHIC	• OCTASTROPHIC adj. consisting of eight strophes.

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 1Word.ws and WikWik.org.

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English Wiktionary: 34 words
Scrabble in French: 4 words
Scrabble in Spanish: 1 word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: 9 words

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