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There are 14 fifteen-letter words containing A, C, 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.
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.
HOMOPLASTICALLYhomoplastically adv. In a homoplastic sense.
HOMOPLASTIC adv. similar in structure and development but not descended from a recent common source.
HYPOCHONDRIASMSHYPOCHONDRIASM n. hypochondria.
LYMPHOSARCOMATAlymphosarcomata n. Plural of lymphosarcoma.
LYMPHOSARCOMA n. a tumour of the lymph glands.
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.
MYOCARDIOGRAPHSMYOCARDIOGRAPH n. an instrument for recording the movements of heart muscle.
OLIGOCYTHAEMIASOLIGOCYTHAEMIA n. deficiency of red corpuscles in blood.
POLYCHROMATISMSPOLYCHROMATISM n. being multicoloured.
PROSENCHYMATOUSprosenchymatous adj. Relating to the prosenchyma.
PROSENCHYMATOUS adj. relating to prosenchyma, supporting plant tissue containing little protoplasm.

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: 105 words
  • Scrabble in French: 6 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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