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There are 16 thirteen-letter words containing SPERMAT

PANSPERMATISMpanspermatism n. (Historical) The obsolete theory that germs are omnipresent.
PANSPERMATISM n. the theory that life could be diffused through the universe by means of germs carried by meteorites, also PANSPERMIA, PANSPERMISM, PANSPERMY.
PANSPERMATISTpanspermatist n. Alternative form of panspermist.
PANSPERMATIST n. a believer in panspermia.
SPERMATICALLYSPERMATICAL adv. pertaining to sperm, also SPERMATIC, SPERMIC, SPERMOUS.
SPERMATOBLASTspermatoblast n. (Dated) A spermatocyte.
SPERMATOBLAST n. a sperm-producing cell.
SPERMATOCELESspermatoceles n. Plural of spermatocele.
SPERMATOCELE n. a cystic swelling of the testicle arising from the epididymis and containing sperm.
SPERMATOCIDALspermatocidal adj. Synonym of spermicidal.
SPERMATOCIDAL adj. of or like a spermatocide, a substance that kills sperm.
SPERMATOCIDESspermatocides n. Plural of spermatocide.
SPERMATOCIDE n. a substance that kills sperm.
SPERMATOCYTESspermatocytes n. Plural of spermatocyte.
SPERMATOCYTE n. a cell producing spermatozoa.
SPERMATOGENICspermatogenic adj. Of or relating to spermatogenesis.
SPERMATOGENIC adj. relating to spermatogenesis, the formation of spermatozoa, also SPERMATOGENETIC, SPERMATOGENOUS.
SPERMATOGONIAspermatogonia n. Plural of spermatogonium.
SPERMATOGONIUM n. a primitive male germ cell.
SPERMATOPHOREspermatophore n. (Biology) A spermospore.
spermatophore n. (Zoology) A capsule or pocket enclosing a number of spermatozoa, found in many annelids, brachiopods…
SPERMATOPHORE n. a case enclosing the spermatozoa of certain crustaceans, molluscs and amphibians.
SPERMATOPHYTEspermatophyte n. (Botany) Any plant that bears seeds rather than spores.
SPERMATOPHYTE n. a seed plant.
SPERMATORRHEAspermatorrhea n. Alternative form of spermatorrhoea.
SPERMATORRHEA n. involuntary seminal discharge without orgasm, also SPERMATORRHOEA.
SPERMATOTHECAspermatotheca n. Synonym of spermatheca.
SPERMATOTHECA n. a receptacle for storing sperm.
SPERMATOZOANSspermatozoans n. Plural of spermatozoan.
SPERMATOZOAN n. a male sex cell, also SPERMATOZOON.
SPERMATOZOIDSspermatozoids n. Plural of spermatozoid.
SPERMATOZOID n. a motile male gamete of a plant usually produced in an antheridium.

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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