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There are 9 twelve-letter words containing RIDO

ACARIDOMATIA• ACARIDOMATIUM n. a habitat for mites provided by certain plants that benefit from their presence, also ACARODOMATIUM.
HALOPERIDOLS• haloperidols n. Plural of haloperidol.
• HALOPERIDOL n. a synthetic tranquillizing drug used in treating psychiatric illnesses.
IRIDOLOGISTS• iridologists n. Plural of iridologist.
• IRIDOLOGIST n. one who practises iridology.
PTERIDOMANIA• pteridomania 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.
PTERIDOPHYTE• pteridophyte 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.
PTERIDOSPERM• pteridosperm 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.
PYRIDOXAMINE• pyridoxamine 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.
TRIDOMINIUMS• tridominiums 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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