(stress var.), a. Having three sides, trilateral (either as a plane figure or flat body with three edges, triangular; or as a solid figure or body with three lateral surfaces, trihedral); fig. having three parts or aspects.
1601. Holland, Pliny (1634), II. 489. In the triumph … he made a shew of three-sided tables, cup-bourds, and bourds, supported by one foot all of brasse.
1793. Martyn, Lang. Bot., Three-sided stem,… having three plane sides.
1823. H. J. Brooke, Introd. Crystallogr., 115. Dodecahedrons with triangular planes, appearing as three-sided pyramids on the planes of the tetrahedron.
1878. H. H. Gibbs, Ombre, 8. One of those three-sided tables with pits in them to hold the counters.
1901. Westm. Gaz., 5 Feb., 10/1. The taste of Queen Victoria in books was … a three-sided taste.
