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There are 7 twelve-letter words containing ROSA

COELUROSAURScoelurosaurs n. Plural of coelurosaur.
COELUROSAUR n. a bipedal carnivorous dinosaur of the Triassic and Cretaceous periods.
FIBROSARCOMAfibrosarcoma n. (Oncology) A fibroblastic sarcoma: a malignant tumor derived from fibrous connective tissue.
FIBROSARCOMA n. a sarcoma formed of spindle-shaped cells in collagenous fibrils.
LEPROSARIUMSleprosariums n. Plural of leprosarium.
LEPROSARIUM n. a hospital for lepers.
NITROSAMINESnitrosamines n. Plural of nitrosamine.
NITROSAMINE n. a liquid obtained from chloroacetic acid and sodium nitrate and used as a solvent and as a fuel.
NITROSATIONSnitrosations n. Plural of nitrosation.
NITROSATION n. conversion of ammonium salts into nitrites.
PROSAUROPODSprosauropods n. Plural of prosauropod.
PROSAUROPOD n. a reptile-like dinosaur of the division Prosauropoda which lived in the Triassic period.
PTEROSAURIANpterosaurian adj. (Paleontology) Of or relating to the Pterosauria.
pterosaurian n. (Paleontology) Any of the Pterosauria; a pterosaur.
PTEROSAURIAN n. a pterodactyl, also PTEROSAUR.

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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