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There are 19 thirteen-letter words containing H, I, M, 2O, R, S and Y

CHROMATOLYSISchromatolysis n. The dissolution of the Nissl bodies in the cell body of a neuron.
CHROMATOLYSIS n. the dissolution and breaking up of chromophil material (as chromatin) of a cell and esp. a nerve cell.
HYDROFORMINGSHYDROFORMING n. the catalytic reforming of petroleum to increase the proportion of aromatic and branched-chain hydrocarbons.
HYDROMEDUSOIDHYDROMEDUSOID n. a hydromedusa, also HYDROMEDUSA, HYDROMEDUSAN.
HYDROTROPISMShydrotropisms n. Plural of hydrotropism.
HYDROTROPISM n. growth in the direction of water.
HYLOMORPHISMShylomorphisms n. Plural of hylomorphism.
HYLOMORPHISM n. the belief that matter is the cause of the universe.
HYSTEROTOMIEShysterotomies n. Plural of hysterotomy.
HYSTEROTOMY n. a Caesarean cut.
HYSTRICOMORPHhystricomorph n. Any Old World porcupine of the family Hystricidae.
HYSTRICOMORPH n. any rodent of a suborder which includes porcupines, cavies, agoutis, and chinchillas.
MICROPHYLLOUSmicrophyllous adj. (Phytotomy) Of or having microphyll leaves.
MICROPHYLLOUS adj. having minute leaves.
MYTHOLOGISERSmythologisers n. Plural of mythologiser.
MYTHOLOGISER n. one who mythologises, also MYTHOLOGIZER.
MYTHOLOGIZERSmythologizers n. Plural of mythologizer.
MYTHOLOGIZER n. one who mythologizes, also MYTHOLOGISER.
POLYMORPHISMSpolymorphisms n. Plural of polymorphism.
POLYMORPHISM n. the circumstance in which two minerals with different crystalline structures have identical chemical compositions, e.g. diamond and graphite.
PYROMORPHITESpyromorphites n. Plural of pyromorphite.
PYROMORPHITE n. a green, brown, or yellow lead ore.
REMYTHOLOGISEREMYTHOLOGISE v. to mythologise again, also REMYTHOLOGIZE.
RHYTHMOPOEIASRHYTHMOPOEIA n. the art of composing rhythmically.
STOECHIOMETRYstœchiometry n. Obsolete spelling of stoichiometry.
STOECHIOMETRY n. the branch of chemistry that deals with the numerical proportions in which substances react, also STOICHIOMETRY.
STOICHIOMETRYstoichiometry n. (Uncountable, chemistry) The study and calculation of quantitative (measurable) relationships of the…
stoichiometry n. (Countable, chemistry) The quantitative relationship between the reactants and products of a specific…
STOICHIOMETRY n. the branch of chemistry that deals with the numerical proportions in which substances react, also STOECHIOMETRY.
THROMBOLYTICSthrombolytics n. Plural of thrombolytic.
THROMBOLYTIC n. a thrombolytic drug.
TOPOCHEMISTRYtopochemistry n. (Chemistry) The chemistry of reactions that are dependent on, or change, the topology of the reactants.
TOPOCHEMISTRY n. the study of reactions that only occur at specific regions in a system.
ZYGOMORPHISMSZYGOMORPHISM n. the state of being zygomorphic, bilaterally symmetrical.

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: 86 words
  • Scrabble in French: 8 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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