Spermatotheca: the sac or reservoir in the female, that receives the sperm during coition: = spermatheca and receptaculum seminis.
Spermatozoön-zoa: the male cell or cells which, by uniting with the ova, fertilize them.
Spherical: in the form of a sphere: a body in which all diameters are equal.
Spherule: a minute sphere or globule.
Spicula: a slender needle-like process: e.g. the sting in bees: also employed as = ovipositor: q.v.
Spiculiform: like a slender, needle-like process.
Spiculum: a small spicule or thin, pointed process.
Spinate: produced into an acuminate spine.
Spindle-shaped: cylindrical, elongate, thicker in the middle, tapering to each end: fusiform.
Spine: a sharp process: in Coccidae there are two, one each side of each segment of the pygidium.