Sub, in composition, means almost, or approaching to; as sub-globose, somewhat globular.
Subarcuated, somewhat arched.
Sub-conic, somewhat conical.
Sub-diaphanous, somewhat transparent or clear.
Sub-rotund, nearly globular.
Subulate, awl-shaped.
Sulcated, furrowed.
Sulci, furrows or ridges.
Summit, the tip or apex.
Sature, a hollow line of division in univalve shells, the spiral line of which separates the wreaths.