triaxial

adj

Etymology: Etymology tree Proto-Indo-European *tréyes Proto-Indo-European *tri- Proto-Italic *tri- Latin tri-der. English tri- Proto-Indo-European *h₂eǵ-? Proto-Indo-European *-os Proto-Indo-European *h₂eḱs-der. Proto-Italic *aksis Latin axisbor. English axis Proto-Indo-European *h₂el-der.? Proto-Italic *-ālis Latin -ālisbor. Old French -albor. ▲ Latin -ālis Old French -elbor. ▲ Latin -ālisbor. Middle English -al English -al English axial English triaxial From tri- + axial.

1. Having three axes.

   “triaxial graph paper”

2. Having three planes of symmetry (e.g. having the shape of a scalene ellipsoid) and thus two axes of rotation
3. Along all three axes

   “triaxial stress-testing of solids”