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There are 20 thirteen-letter words containing H, I, 3O, S and 2T

HEORTOLOGISTSheortologists n. Plural of heortologist.
HEORTOLOGIST n. one who practises heortology, the study of religious feasts.
HOMOEOPATHISThomoeopathist n. Alternative form of homeopathist.
homœopathist n. Obsolete form of homeopathist.
HOMOEOPATHIST n. one who practises homoeopathy, also HOMEOPATH, HOMEOPATHIST, HOMOEOPATH.
METHODOLOGISTmethodologist n. A person who studies methodology, or applies its principles.
METHODOLOGIST n. a student of methodology.
ODONTORNITHESODONTORNITHES n. fossil birds with teeth.
OPISTHOSOMATAopisthosomata n. Plural of opisthosoma.
OPISTHOSOMA n. the abdomen of a spider or other arachnid.
ORNITHOLOGISTornithologist n. A person who studies or practices ornithology.
ORNITHOLOGIST n. one who studies birds.
ORTHODONTISTSorthodontists n. Plural of orthodontist.
ORTHODONTIST n. one who practises orthodontics.
ORTHOPTEROIDSorthopteroids n. Plural of orthopteroid.
ORTHOPTEROID n. a member of the Orthoptera, cockroaches.
ORTHOSTICHOUSorthostichous adj. (Botany) Having orthostichies.
ORTHOSTICHOUS adj. arranged in vertical rows.
ORTHOTROPISMSORTHOTROPISM n. vertical growth.
PHOTOPOSITIVEphotopositive adj. (Biology) having a positive phototropic or phototactic response; attracted by light.
PHOTOPOSITIVE adj. exhibiting positive phototropism or phototaxis.
PHOTOTROPISMSphototropisms n. Plural of phototropism.
PHOTOTROPISM n. movement directed by light.
PHOTOVOLTAICSphotovoltaics n. (Physics) The technology of the conversion of sunlight into electricity using semiconductors that exhibit…
PHOTOVOLTAICS n. the science and technology of photovoltaic devices and substances.
PROSTHODONTIAPROSTHODONTIA n. the provision of false teeth, also PROSTHODONTICS.
PROTOHISTORICprotohistoric adj. Of or pertaining to protohistory.
PROTOHISTORIC adj. relating to protohistory.
PROTOTROPHIESprototrophies n. Plural of prototrophy.
PROTOTROPHY n. the state of being prototrophic.
SOMATOTROPHICsomatotrophic adj. That stimulates body growth, especially by producing somatotrophin.
SOMATOTROPHIC adj. promoting bodily growth, also SOMATOTROPIC.
SOMATOTROPHINsomatotrophin n. Alternative spelling of somatotropin.
SOMATOTROPHIN n. a polypeptide growth hormone, also SOMATOTROPIN, SOMATOTROPINE.
THORACOTOMIESthoracotomies n. Plural of thoracotomy.
THORACOTOMY n. surgical incision of the chest wall.
TROPHOTROPISMtrophotropism n. The movements of the organs in a growing plant, as towards nutrient substances, induced by the chemical…
TROPHOTROPISM n. direction of growth by nutritional factors.

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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See this list for:

  • English Wiktionary: 72 words
  • Scrabble in French: 9 words
  • Scrabble in Spanish: 3 words
  • Scrabble in Italian: 2 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 7 words


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