angle vs separatrix

angle

noun
  • A projecting or sharp corner; an angular fragment. 

  • A figure formed by two rays which start from a common point (a plane angle) or by three planes that intersect (a solid angle). 

  • A change in direction. 

  • Any of the four cardinal points of an astrological chart: the Ascendant, the Midheaven, the Descendant and the Imum Coeli. 

  • A fishhook; tackle for catching fish, consisting of a line, hook, and bait, with or without a rod. 

  • A corner where two walls intersect. 

  • A storyline between two wrestlers, providing the background for and approach to a feud. 

  • Any of various hesperiid butterflies. 

  • The focus of a news story. 

  • The measure of such a figure. In the case of a plane angle, this is the ratio (or proportional to the ratio) of the arc length to the radius of a section of a circle cut by the two rays, centered at their common point. In the case of a solid angle, this is the ratio of the surface area to the square of the radius of the section of a sphere. 

  • An ulterior motive; a scheme or means of benefitting from a situation, usually hidden, often immoral 

  • A viewpoint; a way of looking at something. 

verb
  • To present or argue something in a particular way or from a particular viewpoint. 

  • To change direction rapidly. 

  • To try to catch fish with a hook and line. 

  • To place (something) at an angle. 

  • To attempt to subtly persuade someone to offer a desired thing. 

  • To hamper (oneself or one's opponent) by leaving the cue ball in the jaws of a pocket such that the surround of the pocket (the "angle") blocks the path from cue ball to object ball. 

separatrix

noun
  • A terminator: a line on a partially-illuminated surface separating the lit and shaded regions. 

  • The ⟨L⟩ or pipe ⟨|⟩ mark formerly used to divide integers from decimals. 

  • The proofreader's mark resembling a slash ⟨ / ⟩ or vertical bar ⟨ | ⟩ placed after a note in the margin to indicate that it should replace the item(s) struckthrough in the running text or to separate it from other margin notes. 

  • The line between regions having different magnetic fields. 

  • The boundary separating two modes of behavior in a differential equation. 

How often have the words angle and separatrix occurred in a corpus of books? (source: Google Ngram Viewer )