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There are 20 words beginning with EXOS

EXOSKELETAL	• exoskeletal adj. Pertaining to the exoskeleton. • exoskeletal adj. (Engineering, of a turbine) Having rotor blades extending inwards from the inner surface of a rotating… • EXOSKELETAL adj. relating to an exoskeleton.
EXOSKELETON	• exoskeleton n. (Anatomy) A hard outer structure that provides both structure and protection to creatures such as insects… • EXOSKELETON n. an external skeleton.
EXOSKELETONS	• exoskeletons n. Plural of exoskeleton. • EXOSKELETON n. an external skeleton.
EXOSMIC	• EXOSMIC adj. relating to exosmose, a form of osmosis.
EXOSMOSE	• exosmose n. Archaic form of exosmosis. • EXOSMOSE n. osmosis outwards, i.e. away from the solution, also EXOSMOSIS.
EXOSMOSES	• exosmoses n. Plural of exosmosis. • EXOSMOSE n. osmosis outwards, i.e. away from the solution, also EXOSMOSIS.
EXOSMOSIS	• exosmosis n. Osmosis in which fluid flows through a membrane towards a region of lower concentration. • EXOSMOSIS n. osmosis outwards, i.e. away from the solution, also EXOSMOSE.
EXOSMOTIC	• exosmotic adj. Relating to exosmosis. • EXOSMOTIC adj. pertaining to exosmose, osmosis outwards.
EXOSPHERE	• exosphere n. The uppermost layer of a planet’s atmosphere. • exosphere n. An extremely thin atmosphere, as on Saturn’s moon Dione. • EXOSPHERE n. the outermost layer of the earth's atmosphere.
EXOSPHERES	• exospheres n. Plural of exosphere. • EXOSPHERE n. the outermost layer of the earth's atmosphere.
EXOSPHERIC	• exospheric adj. Of or pertaining to an exosphere. • EXOSPHERIC adj. related to the exosphere, the outermost layer of the earth's atmosphere, also EXOSPHERICAL.
EXOSPHERICAL	• EXOSPHERICAL adj. related to the exosphere, the outermost layer of the earth's atmosphere, also EXOSPHERIC.
EXOSPORAL	• exosporal adj. Relating to an exospore. • EXOSPORAL adj. of or like an exospore, the extreme outer layer of a spore.
EXOSPORE	• exospore n. The outer layer of a spore, especially in some algae and fungi. • EXOSPORE n. the outer covering of a spore.
EXOSPORES	• exospores n. Plural of exospore. • EXOSPORE n. the outer covering of a spore.
EXOSPORIA	• exosporia n. Plural of exosporium. • EXOSPORIUM n. the outermost layer of spores of certain bacilli.
EXOSPORIUM	• exosporium n. (Botany) The outer layer of a pollen grain or spore; the exine. • EXOSPORIUM n. the outermost layer of spores of certain bacilli.
EXOSPOROUS	• exosporous adj. Relating to an exospore. • EXOSPOROUS adj. of or like an exospore, the extreme outer wall of a spore; the epispore.
EXOSTOSES	• exostoses n. Plural of exostosis. • EXOSTOSIS n. any protuberance of a bone which is not natural.
EXOSTOSIS	• exostosis n. A benign bony growth, often covered with cartilage, on the surface of a bone or tooth. • EXOSTOSIS n. any protuberance of a bone which is not natural.

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: 82 words
Scrabble in French: 9 words
Scrabble in Spanish: 3 words
Scrabble in Italian: no word
Scrabble in German: 1 word
Scrabble in Romanian: 37 words

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