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There are 16 nine-letter words containing OSTO

APOSTOLIC	• apostolic adj. (Religion, Christianity) Pertaining to apostles or their practice of teaching; pertaining to the apostles… • apostolic adj. According to the doctrines of the apostles; delivered or taught by the apostles. • apostolic adj. Of or pertaining to the pope or the papacy; papal.
COLOSTOMY	• colostomy n. (Surgery) An incision into the colon to allow for drainage; the opening produced in such incision. • COLOSTOMY n. a surgical incision in the colon to provide an artificial anus through the abdominal wall in cases of stricture etc.
COSTOTOMY	• costotomy n. (Surgery) Incision into a rib. • COSTOTOMY n. surgical incision into a rib.
DOLOSTONE	• dolostone n. (Geology) A sedimentary carbonate rock that contains a high percentage of the mineral dolomite. • DOLOSTONE n. a rock composed of dolomite.
EXOSTOSES	• exostoses n. Plural of exostosis. • EXOSTOSIS n. any protuberance of a bone which is not natural.
EXOSTOSIS	• exostosis n. A benign bony growth, often covered with cartilage, on the surface of a bone or tooth. • EXOSTOSIS n. any protuberance of a bone which is not natural.
HYPOSTOME	• hypostome n. (Anatomy) An appendage on the mouth of some insects, arachnids, crustaceans, and hydrozoa. • HYPOSTOME n. any of several structures associated with the mouth in different invertebrates.
ILEOSTOMY	• ileostomy n. The surgical operation of attaching the ileum to the abdominal wall at a stoma (similar to a colostomy). • ILEOSTOMY n. removal of the ileum, the anterior or superior bone of the pelvis.
IMPOSTORS	• impostors n. Plural of impostor. • IMPOSTOR n. one who poses as another to deceive, also IMPOSTER.
MONOSTOME	• monostome n. A nematode of the genus Monostoma. • MONOSTOME adj. having only one mouth, pore or similar opening, also MONOSTOMOUS.
NOSTOLOGY	• nostology n. The study of senility; gerontology. • NOSTOLOGY n. the study of senility.
OSTOMATES	• ostomates n. Plural of ostomate. • OSTOMATE n. one who has had an ostomy, a type of surgical operation.
OSTOSISES	• OSTOSIS n. the formation of bone.
PREPOSTOR	• prepostor n. Alternative form of prepositor. • PREPOSTOR n. (Latin) the name used for a prefect in some English public schools, also PRAEPOSTOR, PREPOSITOR.
PROSTOMIA	• prostomia n. Plural of prostomium. • PROSTOMIUM n. that portion of the head of an annelid situated in front of the mouth.
XEROSTOMA	• xerostoma n. (Obsolete) The condition of having a dry mouth. • XEROSTOMA n. excessive dryness of the mouth due to insufficient secretions, also XEROSTOMIA.

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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English Wiktionary: 78 words
Scrabble in French: 16 words
Scrabble in Spanish: 14 words
Scrabble in Italian: 53 words
Scrabble in German: 8 words
Scrabble in Romanian: 45 words

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