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There are 9 twelve-letter words containing OSYN

BIOSYNTHESESbiosyntheses n. Plural of biosynthesis.
BIOSYNTHESIS n. the production of a chemical compound by a living organism.
BIOSYNTHESISbiosynthesis n. (Biochemistry) The synthesis of organic compounds within a living organism, especially the synthesis…
BIOSYNTHESIS n. the production of a chemical compound by a living organism.
BIOSYNTHETICbiosynthetic adj. (Biochemistry) of or pertaining to biosynthesis.
BIOSYNTHETIC adj. relating to biosynthesis.
ELEEMOSYNARYeleemosynary adj. Relating to charity, alms, or almsgiving.
eleemosynary adj. Given in charity or alms; having the nature of alms.
eleemosynary adj. Supported by charity.
GEOSYNCLINALgeosynclinal adj. (Geology) Of the Earth’s crust, bending downward or subsiding and permitting the gradual accumulation of sediment.
geosynclinal n. (Geology) The downward bend or subsidence of the Earth’s crust, which permits the gradual accumulation…
GEOSYNCLINAL adj. of or like a geosyncline.
GEOSYNCLINESgeosynclines n. Plural of geosyncline.
GEOSYNCLINE n. a down-warping of the Earth's crust.
IDIOSYNCRASYidiosyncrasy n. A behavior or way of thinking that is characteristic of a person.
idiosyncrasy n. A language or behaviour that is particular to an individual or group.
idiosyncrasy n. (Medicine) A peculiar individual reaction to a generally innocuous substance or factor.
MONOSYNAPTICmonosynaptic adj. (Neuroanatomy) Having, or involving a single synapse.
monosynaptic adj. (Derogatory) Stupid, lacking in brainpower.
MONOSYNAPTIC adj. having or involving a single neural synapse.
MORPHOSYNTAXmorphosyntax n. (Linguistics) Morphology and syntax regarded as an interlinked unit.
morpho-syntax n. (Linguistics) The system of the internal structure of words (morphology) and the way in which words…
morpho-syntax n. (Linguistics, formal) Grammar.

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 WikWik.org and 1Word.ws.

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See this list for:

  • English Wiktionary: 38 words
  • Scrabble in French: 4 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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