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There are 2 twelve-letter words beginning with PROGEST

PROGESTERONEprogesterone n. (Biochemistry, steroids, uncountable) A steroid hormone, secreted by the ovaries, whose function is…
progesterone n. (Biochemistry, steroids, countable) A synthetic version of the compound, used in contraceptive pills…
PROGESTERONE n. a female sex hormone that prepares the uterus for the fertilized ovum and maintains pregnancy.
PROGESTOGENSprogestogens n. Plural of progestogen.
PROGESTOGEN n. any of a range of hormones of the progesterone type.

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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