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There are 9 twelve-letter words containing RIDO

ACARIDOMATIAACARIDOMATIUM n. a habitat for mites provided by certain plants that benefit from their presence, also ACARODOMATIUM.
HALOPERIDOLShaloperidols n. Plural of haloperidol.
HALOPERIDOL n. a synthetic tranquillizing drug used in treating psychiatric illnesses.
IRIDOLOGISTSiridologists n. Plural of iridologist.
IRIDOLOGIST n. one who practises iridology.
PTERIDOMANIApteridomania n. A craze, in 19th-century England, for collecting ferns and for using images of ferns in the decorative arts.
PTERIDOMANIA n. a passion for ferns.
PTERIDOPHYTEpteridophyte n. Any plant of the division Pteridophyta, of simple vascular plants that reproduce via spores rather than…
PTERIDOPHYTE n. the general name for the ferns and their allies.
PTERIDOSPERMpteridosperm n. Any of various extinct gymnosperms, of the division Pteridospermatophyta, resembling ferns, but producing…
PTERIDOSPERM n. an extinct group of seed plants which bore fernlike leaves.
PYRIDOXAMINEpyridoxamine n. (Biochemistry) A constituent of vitamin B6, essential for the metabolism of starch and amino acids.
PYRIDOXAMINE n. a crystalline amine of the vitamin B6 group.
RISPERIDONESSorry, definition not available.
TRIDOMINIUMStridominiums n. Plural of tridominium.
TRIDOMINIUM n. (Latin) threefold rule.

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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