antiprism
|an-ti-priz-əm|
🇺🇸
/ˈæn.ti.prɪ.zəm/
🇬🇧
/ˈæn.tɪ.prɪ.zəm/
rotated prism (bases joined by triangles)
Etymology
'antiprism' originates from Greek, specifically the prefix 'anti-' and the word 'prisma' (πρίσμα), where 'anti-' meant 'against, opposite' and 'prisma' meant 'something sawed' (a prism).
'antiprism' was formed in English by combining the Greek-derived prefix 'anti-' with the existing geometric term 'prism' (which came into English via Latin and Old French from Greek 'prisma'), and it was adopted as a specific geometric term in the modern period (notably used in 19th–20th century geometric literature).
Initially the components suggested an 'opposite' or 'counter' prism; over time the term came to denote the specific polyhedron in which the two polygonal bases are rotated relative to each other and joined by an alternating band of triangles.
Meanings by Part of Speech
Noun 1
a polyhedron composed of two parallel congruent polygonal faces (usually n-sided) in which one is rotated relative to the other and the lateral faces form an alternating band of triangles connecting corresponding vertices.
A square antiprism consists of two square faces and an alternating band of 8 triangles connecting their vertices.
Last updated: 2025/09/07 21:14
