heptagonal

== English == === Etymology === Since 16th century, from heptagon +‎ -al. === Pronunciation === IPA(key): /hɛpˈtæɡənəl/ Rhymes: -æɡənəl === Adjective === heptagonal (not comparable) Having seven angles and sides. (mathematics, of a number) Belonging to the sequence generated by the formula 5 n 2 − 3 n 2 {\displaystyle {\frac {5n^{2}-3n}{2}}} . ==== Synonyms ==== septagonal ==== Derived terms ==== ==== Related terms ==== heptagon septangle septangular ==== Translations ==== === Anagrams === paleognath == Asturian == === Adjective === heptagonal (epicene, plural heptagonales) heptagonal (having seven angles and sides) ==== Synonyms ==== heptágonu == Catalan == === Etymology === From heptàgon +‎ -al. === Pronunciation === IPA(key): (Central) [əp.tə.ɣuˈnal] IPA(key): (Balearic) [əp.tə.ɣoˈnal] IPA(key): (Valencia) [ep.ta.ɣoˈnal] === Adjective === heptagonal m or f (masculine and feminine plural heptagonals) heptagonal == French == === Pronunciation === === Adjective === heptagonal (feminine heptagonale, masculine plural heptagonaux, feminine plural heptagonales) heptagonal === Further reading === “heptagonal”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012 == Portuguese == === Pronunciation === Hyphenation: hep‧ta‧go‧nal === Adjective === heptagonal m or f (plural heptagonais) heptagonal (having seven angles and sides) Synonym: heptágono === Further reading === “heptagonal”, in Dicionário Aulete Digital (in Portuguese), Rio de Janeiro: Lexikon Editora Digital, 2008–2026 “heptagonal”, in Dicionário Priberam da Língua Portuguesa (in Portuguese), Lisbon: Priberam, 2008–2026 == Romanian == === Etymology === Borrowed from French heptagonal. By surface analysis, heptagon +‎ -al. === Adjective === heptagonal m or n (feminine singular heptagonală, masculine plural heptagonali, feminine/neuter plural heptagonale) heptagonal ==== Declension ==== == Spanish == === Pronunciation === IPA(key): /ebtaɡoˈnal/ [eβ̞.t̪a.ɣ̞oˈnal] Rhymes: -al Syllabification: hep‧ta‧go‧nal === Adjective === heptagonal m or f (masculine and feminine plural heptagonales) heptagonal Synonym: heptágono === Further reading === “heptagonal”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8.1, Royal Spanish Academy [Spanish: Real Academia Española], 15 December 2025