Serpentinous: a dirty, dark green [Hooker's green].
Serra: a saw or saw-like part.
Serrate: saw-toothed, the teeth set toward one end.
Serrato-dentate: toothed, the edges themselves saw-toothed.
Serratulate: with little teeth or serrations.
Serricornia: that series of Coleoptera in which the antenna are serrate or saw-toothed.
Serriferous: possessing a saw-like ovipositor in the female; the saw- flies.
Serrulate: with numerous little saw teeth.
Serum: the fluid in which the blood corpuscles float or are suspended.
Sesquialter or Sesquiocellus: a large ocellus including a smaller one.