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There are 7 fifteen-letter words containing SPERM

CASTANOSPERMINEcastanospermine n. (Organic chemistry) A pyrrolizidine alkaloid, found in seeds of trees of the genus Castanosperma, that…
CASTANOSPERMINE n. an alkaloid obtained from the seeds of the Moreton Bay chestnut.
MENISPERMACEOUSmenispermaceous adj. (Botany) Pertaining to the natural family Menispermaceae of climbing plants.
MENISPERMACEOUS adj. belonging to the family Menispermaceae, moonseeds.
SPERMATOBLASTICspermatoblastic adj. Of or relating to a spermatoblast.
SPERMATOBLASTIC adj. of or like a spermatoblast, a sperm-producing cell.
SPERMATOGENESESspermatogeneses n. Plural of spermatogenesis.
SPERMATOGENESIS n. the formation of spermatozoa.
SPERMATOGENESISspermatogenesis n. The process of sperm production in the testes.
SPERMATOGENESIS n. the formation of spermatozoa.
SPERMATOGENETICspermatogenetic adj. Of or pertaining to spermatogenesis.
SPERMATOGENETIC adj. relating to spermatogenesis, the formation of spermatozoa, also SPERMATOGENIC, SPERMATOGENOUS.
SPERMATORRHOEASspermatorrhoeas n. Plural of spermatorrhoea.
SPERMATORRHOEA n. involuntary seminal discharge without orgasm, also SPERMATORRHEA.

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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