Sapphyrinus: sapphire blue [French blue].
Sarcolemma: the elastic covering of the striated muscular fibres.
Sarothrum: the basal joint of posterior tarsus in pollen gatherers: see metatarsus.
Saturate: deeply or strongly marked; in a color, means intense.
Saxicolous: species that frequent rocky or stony areas.
Saws: the ovipositors of the saw flies or Tenthredinidae.
Scaber: uneven, rough.
Scabriculous: regularly and finely wrinkled.
Scabrose -ous: rough like a file, with small raised points.
Scalariform: ladder-like; applied to venation when the veinlets between two longitudinal veins are regularly arranged like the rungs of a ladder.