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There are 18 thirteen-letter words containing H, 3O, P, R and 2T

DIAPHOTOTROPYDIAPHOTOTROPY n. the state of being diaphototropic, turning transversely to the light.
IONTOPHORETICiontophoretic adj. Of or pertaining to iontophoresis.
IONTOPHORETIC adj. relating to iontophoresis.
ORTHOPTEROIDSorthopteroids n. Plural of orthopteroid.
ORTHOPTEROID n. a member of the Orthoptera, cockroaches.
ORTHOTROPISMSORTHOTROPISM n. vertical growth.
PHOTODETECTORphotodetector n. Any device used to detect electromagnetic radiation.
PHOTODETECTOR n. any of various devices for detecting and measuring the intensity of radiant energy through photoelectric action.
PHOTOELECTRONphotoelectron n. (Physics) An electron ejected from the surface of a material by the photoelectric effect.
PHOTOELECTRON n. an electron released from a surface by a photon.
PHOTONEUTRONSphotoneutrons n. Plural of photoneutron.
PHOTONEUTRON n. a neutron emitted from a nucleus as a result of photodisintegration.
PHOTOPRODUCTSphotoproducts n. Plural of photoproduct.
PHOTOPRODUCT n. a product of a photochemical reaction.
PHOTOREACTIONphotoreaction n. (Chemistry) a photochemical reaction.
PHOTOREACTION n. a photochemical reaction.
PHOTORECEPTORphotoreceptor n. (Biology) A specialized neuron or other structure able to detect and react to light.
PHOTORECEPTOR n. a receptor for light stimuli.
PHOTOTROPISMSphototropisms n. Plural of phototropism.
PHOTOTROPISM n. movement directed by light.
PROSTHODONTIAPROSTHODONTIA n. the provision of false teeth, also PROSTHODONTICS.
PROTOCHORDATEprotochordate n. Any chordate of the phyla Hemichordata, Urochordata or Cephalochordata.
PROTOCHORDATE n. a member of the Protochordata.
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.
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: 73 words
  • Scrabble in French: 7 words
  • Scrabble in Spanish: 1 word
  • Scrabble in Italian: 1 word
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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