A feature that distinguishes the two sexes of a species, but is not directly part of the reproductive system.

plural of secondary sex characteristic

(biology) A structure situated between the primary cell wall and the plasma membrane of plant cells

plural of secondary cell wall

(Britain, somewhat dated) a type of school, for pupils who had failed the 11-plus examination, that concentrated on practical and vocational rather than academic subjects

(physics) A technique used to visualize the three-dimensional structure of solids by employing an energetic ion beam to fragment the atomic or molecular constituents from a surface

A British qualification taken by secondary school students in England, Wales and Northern Ireland.