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- Three-sided - a. - Having three sides, especially three plane sides; as, a three-sided stem, leaf, petiole, peduncle, scape, or pericarp.
- Brazil nut - - An oily, three-sided nut, the seed of the Bertholletia excelsa; the cream nut.
- Tourmaline - n. - A mineral occurring usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline (schorl) is the most common variety, but there are also other varieties, as the blue (indicolite), red (rubellite), also green, brown, and white. The red and green varieties when transparent are valued as jewels.
- Three-sided - a. - Having three sides, especially three plane sides; as, a three-sided stem, leaf, petiole, peduncle, scape, or pericarp.
- Subtrihedral - a. - Approaching the form of a three-sided pyramid; as, the subtrihedral crown of a tooth.