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There are 5 nine-letter words beginning with IONO

IONOGENIC	• ionogenic adj. (Chemistry) Capable of forming ions; used especially of the component of an ion exchanger that can be… • IONOGENIC adj. forming ions.
IONOPAUSE	• ionopause n. The boundary layer of the ionosphere, where it meets the mesosphere or exosphere. • IONOPAUSE n. the region of the earth's atmosphere at the outer limit of the ionosphere.
IONOPHORE	• ionophore n. (Chemistry) Any substance that can transfer ions from a hydrophilic medium (such as water) to a hydrophobic… • IONOPHORE n. a chemical compound able to combine with an ion and enable it to pass through a cell membrane.
IONOSONDE	• ionosonde n. A radar for the examination of the ionosphere. • IONOSONDE n. an instrument for measuring ionization.
IONOTROPY	• ionotropy n. (Chemistry) A form of tautomerism involving the movement or redistribution of charges. • ionotropy n. (Physiology) The regulation of neurotransmitters or cell receptors by ion channels. • IONOTROPY n. the reversible interconversion of a pair of organic isomers.

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: 10 words
Scrabble in French: no word
Scrabble in Spanish: 1 word
Scrabble in Italian: 4 words
Scrabble in German: no word
Scrabble in Romanian: 6 words

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