Anulus or Annulus: How To spell?
The word Anulus is misspelled against Annulus, a noun meaning "A ring; a ringlike part or space."
Annulus has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings a & ulus which should not be misspelled with single 'N'
Wrong Spelling:  a-n-ulus  Correct Spelling:  a-nn-ulus 
Check more misspelled words of Annulus to spell it correct.