annular vs looped

annular

adj
  • Banded or marked with circles. 

  • Pertaining to, or having the form of, a ring; ring-shaped; in the shape of an annulus. 

looped

adj
  • formed into a loop 

  • whorled 

  • having loops 

  • drunk 

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