Polyhedron

Definitions

1. A solid figure with many flat faces and straight edges.
2. A polyscope, or multiplying glass.
3. A stage in the growth of Hydrodictyon, when the resting spore breaks up into several megazoospores that put out horn-like appendages; these polyhedra break up into zoospores.

Equivalents

Examples

“Of the convex polyhedra with regular faces, the only ones that have⟳ tetrahedral, octahedral, or icosahedral symmetry are the Platonic and Archimedean solids.”

CEFR level