noun · 4 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
UK:/ˌpɒlɪˈhiːdɹən/
UK:/ˌpɒliːˈhiːdɹən/
UK:/ˌpɒliːˈhiːdɹɒn/
UK, dated:/ˌpɒlɪˈhɛdɹən/
UK:/ˌpɒliːˈhɛdɹən/
UK:/ˌpɒliːˈhɛdɹɒn/
UK:Recorded audio is listed in the source snapshot.
US:/ˌpɑliˈhidɹən/
US:/ˌpɑliˈhidɹɑn/
US:Recorded audio is listed in the source snapshot.
rhymes with -iːdɹən
rhymes with -iːdɹɒn
rhymes with -ɛdɹən
rhymes with -ɛdɹɒn
CMU ARPABET:P AA2 L IY2 HH IY1 D R AH0 N
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
A solid figure with many flat faces and straight edges.
Definition source: English Wiktionary via Wiktextract
Topics: geometry, mathematics, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
A polyscope, or multiplying glass.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 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.
Definition source: English Wiktionary via Wiktextract
Topics: biology, botany, natural-sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
4
noun
Meaning 4
a solid figure bounded by plane polygons or faces
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
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.
Across languages
Translations
51 source translations are retained for this English entry.