principal axis in English
main axis, chief axis
Use "principal axis" in a sentence
1. The line of Apsides connects two such points and is the principal axis of the orbit 2
2. The relation between the inclination angle of the slip line and the angle of principal axis of anisotropy from the uniaxial loading direction is derived.
3. So just remember, Concave has the word 'cave' in it so I always imagine that it's kind of caving inwards caving inwards It's a little bit of an exaggerated drawing but you get the general idea this is a Concave lens right over here and let me draw its principal axis so this is its principal axis shouldn't curve at the beginning just redraw it