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There are 18 thirteen-letter words containing D, H, M, 2O and Y

CHLAMYDOMONASChlamydomonas prop.n. A taxonomic genus within the family Chlamydomonadaceae – a unicellular green alga.
CHLAMYDOMONAS n. a member of the genus Chlamydomonas of (mainly freshwater) green algae.
CHLAMYDOSPOREchlamydospore n. A thick-walled spore that is the resting stage of some bacteria.
CHLAMYDOSPORE n. a thick-walled usually resting fungal spore.
DEMYTHOLOGISEdemythologise v. Alternative spelling of demythologize.
DEMYTHOLOGISE v. to remove mythology from in order to arrive at the basic meaning, also DEMYTHOLOGIZE.
DEMYTHOLOGIZEdemythologize v. (Transitive) To remove the mythological elements of.
DEMYTHOLOGIZE v. to divest of mythological forms in order to uncover the meaning underlying them, also DEMYTHOLOGISE.
DICHOTOMOUSLYdichotomously adv. In a dichotomous manner.
DICHOTOMOUS adv. forking into two equal branches.
DYSMENORRHOEAdysmenorrhoea n. Alternative spelling of dysmenorrhea.
dysmenorrhœa n. Obsolete form of dysmenorrhea.
DYSMENORRHOEA n. painful menstruation, also DYSMENORRHEA.
GYNANDROMORPHgynandromorph n. An insect, crustacean or bird literally having physical characteristics of both sexes, usually displaying…
gynandromorph n. A person having certain physical characteristics of both sexes.
GYNANDROMORPH n. an animal having both male and female characteristics.
HYDROFORMINGSHYDROFORMING n. the catalytic reforming of petroleum to increase the proportion of aromatic and branched-chain hydrocarbons.
HYDROMEDUSOIDHYDROMEDUSOID n. a hydromedusa, also HYDROMEDUSA, HYDROMEDUSAN.
HYDROSOMATOUSHYDROSOMATOUS adj. of or like hydrosomata.
HYDROTROPISMShydrotropisms n. Plural of hydrotropism.
HYDROTROPISM n. growth in the direction of water.
HYPOCHONDRIUMhypochondrium n. (Anatomy) The upper region of the abdomen, below the lower ribs, each side of the epigastrium.
HYPOCHONDRIUM n. either of two regions of the upper part of the abdomen.
LYMPHOADENOMALYMPHOADENOMA n. a tumour of the lymph glands, aka Hodgkin's disease.
MONOPHYODONTSmonophyodonts n. Plural of monophyodont.
MONOPHYODONT n. an animal with only one set of teeth.
OPENMOUTHEDLYopenmouthedly adv. With the mouth open, especially in astonishment.
OPENMOUTHED adv. vociferous.
PHOTODYNAMICSphotodynamics n. The study of the activating effects of light on living organisms.
PHOTODYNAMICS n. the branch of biology concerned with the effects of light on the actions of plants and animals.
RHABDOMYOMATArhabdomyomata n. Plural of rhabdomyoma.
RHABDOMYOMA n. a tumour of striated muscle.
THYROIDECTOMYthyroidectomy n. (Surgery) The surgical removal of part or all of the thyroid gland.
THYROIDECTOMY n. the surgical removal of the thyroid gland.

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: 123 words
  • Scrabble in French: 3 words
  • Scrabble in Spanish: no word
  • Scrabble in Italian: no word
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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