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There are 8 thirteen-letter words containing OSTRA

CIRROSTRATIVEcirrostrative adj. Relating to, or characteristic of cirrostratus clouds.
CIRROSTRATIVE adj. of or like cirrostratus.
CUMULOSTRATUScumulostratus n. Synonym of stratocumulus.
CUMULOSTRATUS n. a type of cloud.
ENTOMOSTRACANentomostracan adj. (Zoology) Relating to the Entomostraca.
entomostracan n. (Zoology) One of the Entomostraca.
ENTOMOSTRACAN n. any of the lower order of crustaceans.
FRACTOSTRATUSFRACTOSTRATUS n. a type of cloud.
GEOSTRATEGIESgeostrategies n. Plural of geostrategy.
GEOSTRATEGY n. a branch of geopolitics that deals with strategy.
GEOSTRATEGISTgeostrategist n. A geopolitical strategist; one concerned with the strategies of political geography.
GEOSTRATEGIST n. one who studies geostrategy.
MALACOSTRACANmalacostracan n. (Zoology) Any of very many crustaceans of the class Malacostraca.
MALACOSTRACAN n. any of a large subclass of crustaceans having a thorax consisting of eight segments usually covered by a carapace and including the decapods and isopods.
PERIOSTRACUMSPERIOSTRACUM n. the horny outer layer of a mollusc's shell.

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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