trian,a.Her.|ˈtraɪən| [app.f. L. trēs, tria three + -an.] In trian aspect: see quot.: cf. three-quartered b. c1828Berry Encycl.Her. I. Gloss., Trian-aspect, showing three-fourth parts of the body, as an eagle, &c. in a trian-aspect: it is what painters term three-quartered.