Sperm

Sperma (sper' -mah). ' The semen, or seed. Sperm-ball, a spheric cluster of spermatozoa. S.-blastoderm, a blastodermic layer of formative spermatozoa. S.-blastula, a spheric blastula whose surface is a sperm-blastoderm. S.-cell. a spermatozoon. S. -morula, a spermatic morula. S.nucleus, the nucleus of a spermatozoon. S.-oil, an oil procured from the deposits in the head of the sperm-whale. In the living animal, the solid spermaceti is held in solution in the liquid sperm-oil; when the liquid becomes cold the spermaceti separates out. The oil is very limpid, relatively free from odor, and burns well in lamps; specific gravity 0.875. It used as a lubricant on account of its low cold-test and its viscosity, and also as an illuminant. S.-rope, a string of spermatozoa.