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There are 9 twelve-letter words containing OTACTI

HETEROTACTIC	• heterotactic adj. Of or pertaining to heterotaxis. • heterotactic adj. (Chemistry, of a polymer) Having substituents arranged in a random configuration in each repeat unit. • HETEROTACTIC adj. abnormally arranged.
PHONOTACTICS	• phonotactics n. (Linguistics, phonology) A branch of phonology that deals with the restrictions a language applies to… • PHONOTACTICS n. the area of phonology concerned with the analysis and description of the permitted sound sequences of a language.
PHYLLOTACTIC	• phyllotactic adj. Of or pertaining to phyllotaxy. • PHYLLOTACTIC adj. of or relating to phyllotaxis, the arrangement of leaves on the stem, also PHYLLOTACTICAL.
PROTACTINIUM	• protactinium n. A chemical element (symbol Pa) with atomic number 91: a dense, silvery-gray actinide metal. • PROTACTINIUM n. a radioactive metallic chemical element, a member of the actinide series which occurs as a decay product in uranium ores.
STEREOTACTIC	• stereotactic adj. Stereotaxic. • STEREOTACTIC adj. involving or used in a surgical technique for directing the tip of a delicate instrument or beam of radiation using coordinates provided by medical imaging, also STEREOTACTICAL.
SYNDIOTACTIC	• syndiotactic adj. (Chemistry, of a polymer) Having substituents arranged in alternating (rather than random) configuration… • SYNDIOTACTIC adj. of a stereospecific polymer, having alternating stereochemical configurations of the groups on successive carbon atoms in the chain.
THERMOTACTIC	• thermotactic adj. Relating to thermotaxis. • THERMOTACTIC adj. of or showing thermotaxis, also THERMOTAXIC.
THIGMOTACTIC	• thigmotactic adj. Relating to thigmotaxis. • THIGMOTACTIC adj. showing thigmotaxis.
TROPHOTACTIC	• TROPHOTACTIC adj. relating to trophotaxis, chemotaxis and chemotropism where the stimulating substance is food.

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.

See this list for:

English Wiktionary: 33 words
Scrabble in French: 2 words
Scrabble in Spanish: 3 words
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: 7 words

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