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There are 4 nine-letter words beginning with ISOS

ISOSCELES	• isosceles adj. (Geometry) Having (at least) two sides of equal length, used especially of a triangle or trapezoid. • ISOSCELES n. a triangle with two equal sides.
ISOSMOTIC	• isosmotic adj. Having the same osmotic pressure. • ISOSMOTIC adj. of, relating to or exhibiting equal osmotic pressure.
ISOSTATIC	• isostatic n. A line of constant stress. • isostatic n. A state of equilibrium between two forces. • isostatic adj. Of or pertaining to isostasy or isostatics.
ISOSTERIC	• isosteric adj. (Chemistry) Of or pertaining to isosteres. • isosteric adj. (Physics) Having constant specific volume over time or space. • ISOSTERIC adj. of two different molecules, having the same number of atoms, and the same number and valency of electrons.

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: 18 words
Scrabble in French: 3 words
Scrabble in Spanish: 1 word
Scrabble in Italian: 4 words
Scrabble in German: 2 words
Scrabble in Romanian: 1 word

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