A tumor of stellate or polyhedral cells in a matrix of mucin.
Suppose the polyhedral angle were concave, why would the proof not hold?
Directly superposed to these we find cells which in shape are polyhedral.
In all such cases the relation to the polyhedral angle should be made clear.
The angle between two planes is termed dihedral, between three trihedral, between any number more than three polyhedral.
The bases of the radial spines are connected by prominent concave crests, which form the edges of the polyhedral shell.
Shell subspherical or polyhedral, with fourteen triangular, convex faces, covered with irregular polygonal plates.
The cells of which it is composed are polyhedral, thicker, and more loosely joined, and filled with sap and chlorophyl.
The surfaces of the cells are then seen to form a mosaic, each cell area having a polyhedral shape.
A section of such a polyhedral structure would appear as a tissue of polygons.
1741, from polyhedron + -al (1).