Threeside

adj, noun

Definitions

Adjective
  1. 1
    Having three sides; three-sided, triangular. nonstandard, not-comparable, rare
Noun
  1. 1
    Any object or shape consisting of three sides; triangle. nonstandard, rare

    "[...] let this base-point be indicated by Ax, while the sixth base-point will be indicated by C. Now [c*] contains a threeside formed by a, [...]"

Etymology

Etymology 1

From three + side.

Etymology 2

From three + side.

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