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There are 6 seven-letter words beginning with ISOT

ISOTACH	• isotach n. An isoline linking places on a map which have equal wind speed. • ISOTACH n. a line connecting points of equal wind velocity.
ISOTONE	• isotone n. (Physics) Any of a number of nuclides of different elements that have the same number of neutrons. • isotone adj. (Mathematics) monotone nondecreasing. • ISOTONE n. one of a number of nuclides having the same number of neutrons in the nucleus with differing numbers of protons.
ISOTOPE	• isotope n. (Physics) Any of two or more forms of an element where the atoms have the same number of protons, but… • isotope v. (Topology, transitive) To define or demonstrate an isotopy of (one map with another). • ISOTOPE n. one of two more atoms with the same atomic number that contain different numbers of neutrons.
ISOTOPY	• isotopy n. (Mathematics) A form of homotopy that is always an embedding. • isotopy n. (Linguistics) The repetition of a basic meaning trait (seme) within a story. • ISOTOPY n. the state of being an isotope.
ISOTRON	• isotron n. A device that uses an electrical field to separate the isotopes of uranium. • isotron n. A kind of shortwave antenna consisting of a coil between two angled sheet-metal plates. • ISOTRON n. a device for separating isotopes.
ISOTYPE	• isotype n. (Immunology) A marker corresponding to an antigen found in all members of a subclass of a specific class… • isotype n. (Botany, taxonomy) A duplicate specimen of the holotype, from the same genetic individual. • ISOTYPE n. in taxonomy, a duplicate of the holotype, a specimen made from the same collection as the holotype.

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: 11 words
Scrabble in French: 3 words
Scrabble in Spanish: 2 words
Scrabble in Italian: 10 words
Scrabble in German: 6 words
Scrabble in Romanian: no word

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