menstruum vs river

menstruum

noun
  • Any liquid medium 

  • The menses; menstrual discharge. 

  • A solvent. 

river

noun
  • Any large flow of a liquid in a single body. 

  • The last card dealt in a hand. 

  • One who rives or splits. 

  • A large and often winding stream which drains a land mass, carrying water down from higher areas to a lower point, oftentimes ending in another body of water, such as an ocean or in an inland sea. 

  • A visually undesirable effect of white space running down a page, caused by spaces between words on consecutive lines happening to coincide. 

verb
  • To improve one’s hand to beat another player on the final card in a poker game. 

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