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There are 6 nine-letter words beginning with THYR

THYRATRON	• thyratron n. (Electronics) Any of several types of thermoelectric valve once used as a high-speed switch. • THYRATRON n. a gas-filled valve with a heated cathode, able to carry very high currents.
THYREOIDS	• THYREOID n. a shield-shaped bone.
THYRISTOR	• thyristor n. (Electronics) A semiconductor diode having an extra "gate" terminal to switch it on. • THYRISTOR n. a thyratron-like solid-state semiconductor device.
THYROIDAL	• thyroidal adj. (Physiology) Of, pertaining to, or affecting the thyroid. • THYROIDAL adj. relating to the thyroid gland.
THYROXINE	• thyroxine n. (Biochemistry) A hormone (an iodine derivative of tyrosine), produced by the thyroid gland, that regulates… • THYROXINE n. an iodine compound, a hormone forming the active principle of the thyroid gland, also THYROXIN.
THYROXINS	• thyroxins n. Plural of thyroxin. • THYROXIN n. an iodine compound, a hormone forming the active principle of the thyroid gland, also THYROXINE.

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: 14 words
Scrabble in French: 5 words
Scrabble in Spanish: no word
Scrabble in Italian: 1 word
Scrabble in German: 1 word
Scrabble in Romanian: no word

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