graze vs separatrix

graze

noun
  • A light abrasion; a slight scratch. 

  • The act of grazing; a scratching or injuring lightly on passing. 

  • The act of animals feeding from pasture. 

verb
  • To cause a slight wound to; to scratch. 

  • To feed or supply (cattle, sheep, etc.) with grass; to furnish pasture for. 

  • To eat small amounts of food periodically throughout the day, rather than at fixed mealtimes, often not in response to hunger. 

  • To yield grass for grazing. 

  • To feed on; to eat (growing herbage); to eat grass from (a pasture) 

  • To rub or touch lightly the surface of (a thing) in passing. 

  • To tend (cattle, etc.) while grazing. 

  • To shoplift by consuming food or drink items before reaching the checkout. 

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 graze and separatrix occurred in a corpus of books? (source: Google Ngram Viewer )