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There are 4 words beginning with ETHYN

ETHYNE	• ethyne n. (Organic chemistry, official IUPAC name) The organic compound acetylene. The simplest alkyne, a colorless… • ETHYNE n. a colourless toxic inflammable gas formed by the action of water on calcium carbide, aka acetylene.
ETHYNES	• ethynes n. Plural of ethyne. • ETHYNE n. a colourless toxic inflammable gas formed by the action of water on calcium carbide, aka acetylene.
ETHYNYL	• ethynyl n. (Organic chemistry) The univalent radical HC≡C- derived from acetylene. • ETHYNYL n. a univalent chemical radical, also ETHINYL.
ETHYNYLS	• ethynyls n. Plural of ethynyl. • ETHYNYL n. a univalent chemical radical, also ETHINYL.

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: 2 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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