tetrahedron
(noun) any polyhedron having four plane faces
Source: WordNet® 3.1
tetrahedra
plural of tetrahedron
Source: Wiktionary
Tet`ra*he"dron, n. Etym: [Tetra- + Gr. (Geom.)
Definition: A solid figure inclosed or bounded by four triangles.
Note: In crystallography, the regular tetrahedron is regarded as the hemihedral form of the regular octahedron. Regular tetrahedron (Geom.), a solid bounded by four equal equilateral triangles; one of the five regular solids.
Source: Webster’s Unabridged Dictionary 1913 Edition
11 January 2025
(noun) low evergreen shrub of high north temperate regions of Europe and Asia and America bearing red edible berries
International Coffee Day (September 29) is an occasion to promote and celebrate coffee as a beverage, with events occurring in places across the world. A day to promote fair trade coffee and raise awareness for the coffee growers’ plight. Other countries celebrate this event on October 1.
