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.