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There are 17 fifteen-letter words containing I, S, X and Y

CYTOTAXONOMISTScytotaxonomists n. Plural of cytotaxonomist.
CYTOTAXONOMIST n. a practitioner of cytotaxonomy.
EXPOSTULATINGLYexpostulatingly adv. With expostulations.
EXPOSTULATING adv. EXPOSTULATE, to remonstrate; to discuss or reason with.
HETEROSEXUALITYheterosexuality n. The state of being sexually and romantically attracted primarily or exclusively to persons of the opposite sex.
heterosexuality n. Sexual activity with a person of the opposite sex.
HETEROSEXUALITY n. the state of being heterosexual.
HEXYLRESORCINOLhexylresorcinol n. (Organic chemistry) A hexyl derivative of resorcinol that has anaesthetic, antiseptic and antihelmintic properties.
HEXYLRESORCINOL n. a crystalline phenol used as an antiseptic and anthelmintic.
HYDROXYAPATITEShydroxyapatites n. Plural of hydroxyapatite.
HYDROXYAPATITE n. a complex phosphate of calcium that occurs as a mineral and is the chief structural element of vertebrate bone.
HYDROXYPROLINEShydroxyprolines n. Plural of hydroxyproline.
HYDROXYPROLINE n. an amino acid.
HYPEREXCRETIONSHYPEREXCRETION n. excessive excretion.
HYPEREXTENSIONShyperextensions n. Plural of hyperextension.
HYPEREXTENSION n. the extension of a joint beyond its normal range.
INEXTENSIBILITYinextensibility n. The condition of being inextensible.
INEXTENSIBILITY n. the state of being inextensible.
INTERPAROXYSMALinterparoxysmal adj. Between paroxysms.
INTERPAROXYSMAL adj. between paroxysms.
METHYLXANTHINESmethylxanthines n. Plural of methylxanthine.
METHYLXANTHINE n. a methylated xanthine derivative, such as caffeine, theobromine, or theophylline.
OXYHAEMOGLOBINSoxyhaemoglobins n. Plural of oxyhaemoglobin.
OXYHAEMOGLOBIN n. a loose compound of oxygen and haemoglobin, also OXYHEMOGLOBIN.
PARAMYXOVIRUSESparamyxoviruses n. Plural of paramyxovirus.
PARAMYXOVIRUS n. any of a group of viruses which includes the mumps and measles viruses.
PEROXYSULPHURICPEROXYSULPHURIC adj. as in peroxysulphuric acid.
PHYTOTOXICITIESphytotoxicities n. Plural of phytotoxicity.
PHYTOTOXICITY n. the state of being phytotoxic.
PSYCHOSEXUALITYpsychosexuality n. The psychological aspects of sexuality.
PSYCHOSEXUALITY n. the psychic factors of sex.
STEREOTAXICALLYstereotaxically adv. In a stereotaxic manner.
stereotaxically adv. With regard to stereotaxis.
STEREOTAXIC adv. relating to stereotaxis, the reaction of an organism to contact with a solid body.

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: 238 words
  • Scrabble in French: 9 words
  • Scrabble in Spanish: 5 words
  • Scrabble in Italian: no word
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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