[1] : The Collaborative International Dictionary of English v.0.48

tangent \tan"gent\, a. l. tangens, -entis, p. pr.
   touching; touching at a single point; specifically geom.
   meeting a curve or surface at a point and having at that
   point the same direction as the curve or surface; -- said of
   a straight line, curve, or surface; as, a line tangent to a
   curve; a curve tangent to a surface; tangent surfaces.
   1913 webster

   tangent plane geom., a plane which touches a surface in a
      point or line.

   tangent scale gun., a kind of breech sight for a cannon.
      

   tangent screw mach., an endless screw; a worm.
      1913 webster
      1913 webster
see also:
tangent plane tangent scale tangent screw 

Tangent >> T Words
Tangent, definition of term: Tangent
tangent_pag1.html

Screw >> S Words
Screw, definition of term: Screw
screw_pag1.html

Screw Up >> S Words
Screw Up, definition of term: Screw Up
screw+up_pag1.html

Screw Machine >> S Words
Screw Machine, definition of term: Screw Machine
screw+machine_pag1.html

Female Screw >> F Words
Female Screw, definition of term: Female Screw
female+screw_pag1.html

Allen Screw >> A Words
Allen Screw, definition of term: Allen Screw
allen+screw_pag1.html