polyhedron

Pronunciation: /ˌpɒlɪˈhiːdɹən/

The English word “polyhedron” has 3 meanings listed here.

noun

A solid figure with many flat faces and straight edges.
A polyscope, or multiplying glass.
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.

Etymology

From New Latin polyedron, from Ancient Greek πολύεδρος (polúedros, “having many seats”), from πολυ- (polu-, “many”) + ἕδρα (hédra, “seat”); compare French polyèdre. By surface analysis, poly- + -hedron.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.