spermatozoon
Concise Oxford English Dictionary © 2008 Oxford University Press:
spermatozoon /ˌspəːmətə(ʊ)ˈzəʊɒn, spəˌmat-/
▶noun (pl. spermatozoa /-ˈzəʊə/) Biology the mature motile male sex cell of an animal, by which the ovum is fertilized, typically having a compact head and one or more long flagella for swimming.
– derivatives
spermatozoal adjective,
spermatozoan adjective.
spermatozoal adjective,
spermatozoan adjective.
– origin C19: from Gk sperma, spermat- ‘seed’ + zōion ‘animal’.
'spermatozoon' also found in these Oxford entries:

