triangle
noun
[ ˈtrʌɪaŋɡ(ə)l ]
• a plane figure with three straight sides and three angles.
• "an equilateral triangle"
• an emotional relationship involving a couple and a third person with whom one of them is also involved.
• a small brownish Eurasian moth of oak and beech woods.
Origin:
late Middle English: from Old French triangle or Latin triangulum, neuter of triangulus ‘three-cornered’ (see tri-, angle1).
