1) sâyân (#); 2) tânžânt
1) A straight line or plane that touches a curve or curved surface at one and only one
point. Conversely, a curve or curved surface that touches a straight line, curve, or curved
surface at one and only one point.
From L. tangentem (nominative tangens), pr.p. of tangere "to touch," from PIE base *tag- "to touch, to handle" (cf. L. tactus "touch," Gk. tetagon "having seized," O.E. þaccian "stroke, strike gently"); tânžânt, loan from Fr.
1) Sâyân, pr.p. of sâyidan "to touch, to rub," variants
Khotanese sauy- "to rub;" Sogdian ps'w- "to touch;" ultimately
Proto-Iranian *sau- "to rub."
Pertaining to or of the nature of a tangent.
Fr.: mouvement tangentiel
That component of a an object's motion which is perpendicular to the observer's → line of sight.
Fr.: vitesse tangentielle
1) The instantaneous linear velocity of a body moving in a circular path.
It is equal to the → angular velocity multiplied
by the radius: vt = ωr.
tangentially polarized light
nur-e qotbide-ye sâyâni
Fr.: lumière polarisée tangentiellement
The → linearly polarized light that vibrates perpendicularly to an imaginary line joining the source to the point of observation.