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List of 13-letter words containing

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There are 11 thirteen-letter words containing I, 3O, P and 3S

COSPONSORSHIPcosponsorship n. Joint sponsorship by more than one party.
COSPONSORSHIP n. the state of being a cosponsor.
ISOSPONDYLOUSisospondylous adj. (Zoology) Of or pertaining to the Isospondyli.
isospondylous adj. (Zoology) Having the anterior vertebrae separate and normal.
ISOSPONDYLOUS adj. of, relating to, or belonging to the Isospondyli, an order of soft-finned teleost fishes that includes the herring, salmon, trout, and pike.
NONPOSSESSIONnonpossession n. (Uncountable) Lack of possession; not possessing something.
nonpossession n. (Countable) That which is not a possession; something not owned.
NONPOSSESSION n. something that is not a possession.
OPSONISATIONSOPSONISATION n. the process of opsonising, also OPSONIZATION.
OSCILLOSCOPESoscilloscopes n. Plural of oscilloscope.
OSCILLOSCOPE n. an instrument for detecting electrical fluctuations.
OSTEOPETROSISosteopetrosis n. (Pathology) A rare hereditary disorder characterized by hard, dense bones.
OSTEOPETROSIS n. a general name for a group of hereditary bone diseases, including marble bone disease, in which bone becomes abnormally dense.
PHOTOFISSIONSphotofissions n. Plural of photofission.
photofissions v. Third-person singular simple present indicative form of photofission.
PHOTOFISSION n. nuclear fission induced by gamma rays.
POISONOUSNESSpoisonousness n. The state or quality of being poisonous.
POISONOUS n. having the quality or effect of poison.
POSTPOSITIONSpostpositions n. Plural of postposition.
POSTPOSITION n. the placing of a grammatical element after a word to which it is primarily related in a sentence.
SPONGOLOGISTSspongologists n. Plural of spongologist.
SPONGOLOGIST n. one who studies sponges.
TOXOPLASMOSIStoxoplasmosis n. A disease, caused by the parasite Toxoplasma gondii, that primarily affects felids, but also other mammals…
TOXOPLASMOSIS n. an infection of animals (esp. the domestic cat) and humans by microorganisms, prob protozoa, of the genus Toxoplasma.

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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See this list for:

  • English Wiktionary: 34 words
  • Scrabble in French: 26 words
  • Scrabble in Spanish: 9 words
  • Scrabble in Italian: 13 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 2 words


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