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There are 19 eleven-letter words containing ETHA

BIOETHANOLS	• bioethanols n. Plural of bioethanol. • BIOETHANOL n. ethanol produced from fermented plant material, used as a petrol additive or substitute.
DETHATCHERS	• dethatchers n. Plural of dethatcher. • de-thatchers n. Plural of de-thatcher.
DETHATCHING	• dethatching v. Present participle of dethatch. • DETHATCH v. to remove thatch from.
ETHAMBUTOLS	• ETHAMBUTOL n. a drug used in the treatment of tuberculosis.
ETHANEDIOIC	• ETHANEDIOIC adj. designating a type of acid.
ETHANEDIOLS	• ETHANEDIOL n. a clear colourless syrupy soluble liquid substance, used as an antifreeze and solvent.
LETHALITIES	• lethalities n. Plural of lethality. • LETHALITY n. the quality of being lethal.
LETHARGICAL	• lethargical adj. (Archaic) lethargic. • LETHARGICAL adj. showing lethargy, also LETHARGIC.
LETHARGISED	• lethargised v. Simple past tense and past participle of lethargise. • LETHARGISE v. to make lethargic, also LETHARGIZE.
LETHARGISES	• lethargises v. Third-person singular simple present indicative form of lethargise. • LETHARGISE v. to make lethargic, also LETHARGIZE.
LETHARGIZED	• lethargized v. Simple past tense and past participle of lethargize. • LETHARGIZE v. to make lethargic, also LETHARGISE.
LETHARGIZES	• lethargizes v. Third-person singular simple present indicative form of lethargize. • LETHARGIZE v. to make lethargic, also LETHARGISE.
METHACRYLIC	• methacrylic adj. Of or pertaining to methacrylic acid or its derivatives. • METHACRYLIC adj. denoting a type of acid.
METHANAMIDE	• methanamide n. (Organic chemistry) Formamide. • METHANAMIDE n. an amide derived from formic acid, aka formamide.
METHANATION	• methanation n. (Organic chemistry) The reaction of hydrogen and carbon monoxide to form methane. • METHANATION n. the production of methane esp. from carbon monoxide and hydrogen.
NIKETHAMIDE	• nikethamide n. A stimulant which mainly affects the respiratory cycle. • NIKETHAMIDE n. a drug used as a heart stimulant, aka coramine.
POLYURETHAN	• POLYURETHAN n. any of various polymers used esp. in flexible and rigid foams, elastomers, and resins, also POLYURETHANE.
SEMILETHALS	• semilethals n. Plural of semilethal. • SEMILETHAL n. a mutation that tends to be lethal but is not always.
SUBLETHALLY	• sublethally adv. In a sublethal manner, or to a sublethal extent. • SUBLETHAL adv. not quite fatal.

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 1Word.ws and WikWik.org.

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English Wiktionary: 85 words
Scrabble in French: 18 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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