Standard Lemma guide
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noun
A triangular figure consisting of ten points arranged in four rows, representing the fourth triangular number and having mystical significance to the Pythagoreans.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
Borrowed from Ancient Greek τετρακτύς (tetraktús).
