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There are 19 twelve-letter words beginning with SPERM

SPERMAGONIUM	• spermagonium n. (Lichenology) Alternative spelling of spermogonium. • SPERMAGONIUM n. a receptacle in which spermatia are produced in some fungi and lichens.
SPERMAPHYTES	• spermaphytes n. Plural of spermaphyte. • SPERMAPHYTE n. any member of the Spermatophyta, seed-bearing plants, also SPERMOPHYTE.
SPERMAPHYTIC	• spermaphytic adj. Synonym of spermatophytic. • SPERMAPHYTIC adj. of or like a spermaphyte, also SPERMOPHYTIC.
SPERMATHECAE	• spermathecae n. Plural of spermatheca. • SPERMATHECA n. a receptacle for storing spermatozoa in insects.
SPERMATHECAL	• spermathecal adj. Of or pertaining to a spermatheca. • SPERMATHECAL adj. of or like a spermatheca, a receptacle for storing spermatozoa in insects.
SPERMATHECAS	• spermathecas n. Plural of spermatheca. • SPERMATHECA n. a receptacle for storing spermatozoa in insects.
SPERMATOCELE	• spermatocele n. A retention cyst of a tubule of the rete testis or the head of the epididymis distended with barely… • SPERMATOCELE n. a cystic swelling of the testicle arising from the epididymis and containing sperm.
SPERMATOCIDE	• spermatocide n. Spermicide. • SPERMATOCIDE n. a substance that kills sperm.
SPERMATOCYTE	• spermatocyte n. (Cytology) A male gametocyte, from which a spermatozoon develops. • SPERMATOCYTE n. a cell producing spermatozoa.
SPERMATOGENY	• spermatogeny n. The generation of spermatozoa. • SPERMATOGENY n. the formation of spermatozoa.
SPERMATOZOAL	• spermatozoal adj. Of or pertaining to spermatozoa. • SPERMATOZOAL adj. of or like a spermatozoon, a male sexual cell, which fertilises the egg.
SPERMATOZOAN	• spermatozoan adj. Of or pertaining to spermatozoa. • spermatozoan n. A spermatozoon. • SPERMATOZOAN n. a male sex cell, also SPERMATOZOON.
SPERMATOZOIC	• spermatozoic adj. (Cytology) Of or pertaining to spermatozoa; of the nature of spermatozoa. • SPERMATOZOIC adj. of or like a spermatozoon, a male sex cell.
SPERMATOZOID	• spermatozoid n. (Biology) A motile, ciliated male gamete produced in the antheridium of an alga, fern or gymnosperm. • SPERMATOZOID n. a motile male gamete of a plant usually produced in an antheridium.
SPERMATOZOON	• spermatozoon n. (Cytology) A reproductive cell or gamete of a male, carried in semen, that fertilizes an ovum to produce a zygote. • spermatozoön n. Alternative spelling of spermatozoon. • SPERMATOZOON n. a male sexual cell, which fertilises the egg, also SPERMATOZOAN.
SPERMOGONIUM	• spermogonium n. (Lichenology) A conceptacle of certain lichens, containing spermatia. • SPERMOGONIUM n. a flask-shaped structure in some fungi, also SPERMOGONE.
SPERMOPHILES	• spermophiles n. Plural of spermophile. • SPERMOPHILE n. a member of family of seed-loving rodents.
SPERMOPHYTES	• spermophytes n. Plural of spermophyte. • SPERMOPHYTE n. any member of the Spermatophyta, seed-bearing plants, also SPERMAPHYTE.
SPERMOPHYTIC	• spermophytic adj. (Botany) Capable of producing seeds. • SPERMOPHYTIC adj. of or like a spermaphyte, also SPERMAPHYTIC.

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.

See this list for:

English Wiktionary: 53 words
Scrabble in French: 8 words
Scrabble in Spanish: no word
Scrabble in Italian: 22 words
Scrabble in German: no word
Scrabble in Romanian: 18 words

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