triad vs trine

triad

noun
  • A grouping of three. 

  • on a CRT display, a group of three neighbouring phosphor dots, coloured green, red, and blue. 

  • A chord consisting of a root tone, the tone two degrees higher, and the tone four degrees higher in a given scale. 

  • A branch of a Chinese underground criminal society, mostly based in Hong Kong. 

  • A word of three syllables. 

trine

noun
  • A group of three things. 

  • An aspect of two astrological bodies when 120° apart. 

verb
  • To put in the aspect of a trine. 

adj
  • Triple; threefold. 

  • Denoting the aspect of two celestial bodies which are 120° apart. 

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