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There are 19 fifteen-letter words containing A, E, H, M, 2O, S and Y

ARCHEOASTRONOMYarcheoastronomy n. Alternative spelling of archaeastronomy.
ARCHEOASTRONOMY n. the scientific study of the beliefs and practices concerning astronomy that existed in ancient and prehistoric civilizations.
CHLAMYDOMONADESCHLAMYDOMONAS n. a member of the genus Chlamydomonas of (mainly freshwater) green algae.
COLLENCHYMATOUScollenchymatous adj. Relating to collenchyma.
COLLENCHYMATOUS adj. relating to collenchyma.
DERMATOPHYTOSESdermatophytoses n. Plural of dermatophytosis.
DERMATOPHYTOSIS n. a fungal infection of the skin, esp. the feet.
DERMATOPHYTOSISdermatophytosis n. (Medicine) A fungal infection of the skin caused by a dermatophyte, ringworm.
DERMATOPHYTOSIS n. a fungal infection of the skin, esp. the feet.
ECTOMYCORRHIZASectomycorrhizas n. Plural of ectomycorrhiza.
ECTOMYCORRHIZA n. a type of mycorrhiza in which the fungus forms a layer on the outside of the roots of the plant.
HAEMOCYTOMETERShaemocytometers n. Plural of haemocytometer.
HAEMOCYTOMETER n. an apparatus for counting the number of cells in a quantity of blood, typically consisting of a graduated pipette for drawing and diluting, also HEMOCYTOMETER.
HOMOCHLAMYDEOUShomochlamydeous adj. (Botany) Having the perianth not divided into calyx and corolla.
HOMOCHLAMYDEOUS adj. with calyx and corolla similar.
HYPOMENORRHOEAShypomenorrhoeas n. Plural of hypomenorrhoea.
HYPOMENORRHOEA n. the condition in which the interval between two menstrual periods is increased to between 35 and 42 days, also HYPOMENORRHEA.
MEGASPOROPHYLLSmegasporophylls n. Plural of megasporophyll.
MEGASPOROPHYLL n. a specialised leaf bearing or subtending one or more megasporangia.
MONOCHLAMYDEOUSmonochlamydeous adj. (Botany) Having a single floral envelope, that is, a calyx without a corolla, or, possibly, in rare…
MONOCHLAMYDEOUS adj. having a one-whorled perianth.
NONHOMOSEXUALLYSorry, definition not available.
OLIGOCYTHAEMIASOLIGOCYTHAEMIA n. deficiency of red corpuscles in blood.
OXYHAEMOGLOBINSoxyhaemoglobins n. Plural of oxyhaemoglobin.
OXYHAEMOGLOBIN n. a loose compound of oxygen and haemoglobin, also OXYHEMOGLOBIN.
PROSENCHYMATOUSprosenchymatous adj. Relating to the prosenchyma.
PROSENCHYMATOUS adj. relating to prosenchyma, supporting plant tissue containing little protoplasm.
SEMIPORNOGRAPHYsemipornography n. Material that is partly or somewhat pornographic.
SEMIPORNOGRAPHY n. material approaching the pornographic.
STREPHOSYMBOLIAstrephosymbolia n. A tendency, associated with word blindness, to twist or invert certain similar letters (such as b and d) when reading.
STREPHOSYMBOLIA n. a visual disorder where letters are seen mirror imaged.
SYMBOLOGRAPHIESSYMBOLOGRAPHY n. symbolic writing or representation.
SYMMETROPHOBIASSYMMETROPHOBIA n. fear of symmetry.

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: 139 words
  • Scrabble in French: 8 words
  • Scrabble in Spanish: 2 words
  • Scrabble in Italian: no word
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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