Arhythmous or Arrhythmous: How To spell?
The word Arhythmous is misspelled against Arrhythmous, an adjective meaning "Being without rhythm or regularity, as the pulse."
Arrhythmous has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings a & hythmous which should not be misspelled with single 'R'
Wrong Spelling:  a-r-hythmous  Correct Spelling:  a-rr-hythmous 
Check more misspelled words of Arrhythmous to spell it correct.