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 There are 6 twelve-letter words containing H, I, 3O, R, T and Y| HISTORIOLOGY | • historiology n. (Obsolete) a discourse on history. • HISTORIOLOGY n. the study of history.
 |  | HOMOIOTHERMY | • homoiothermy n. (Biology) Alternative form of homeothermy. • HOMOIOTHERMY n. the maintenance of a constant body temperature, also HOMEOTHERMISM, HOMEOTHERMY, HOMOTHERMY.
 |  | HOMOPOLARITY | • HOMOPOLARITY n. the state of being homopolar. |  | HYPOTROCHOID | • hypotrochoid n. (Geometry) A geometric curve traced by a fixed point on the radius line outside one circle which rotates… • HYPOTROCHOID n. the curve traced by a point on the radius, or radius produced, of a circle rolling within another circle.
 |  | ORNITHOSCOPY | • ornithoscopy n. Birdwatching. • ORNITHOSCOPY n. bird watching.
 |  | PROTOHISTORY | • protohistory n. The period between prehistory and history, during which a culture or civilization has not yet developed… • PROTOHISTORY n. the study of human beings in the times that immediately antedate recorded history.
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 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.
 
 See this list for:English Wiktionary: 22 wordsScrabble in French: no wordScrabble in Spanish: no wordScrabble in Italian: no wordScrabble in German: no wordScrabble in Romanian: no word
 
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