Casideous or Cassideous: How To spell?
The word Casideous is misspelled against Cassideous, an adjective meaning "Helmet-shaped; -- applied to a corolla having a broad, helmet-shaped upper petal, as in aconite."
Cassideous has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings ca & ideous which should not be misspelled with single 'S'
Wrong Spelling:  ca-s-ideous  Correct Spelling:  ca-ss-ideous 
Check more misspelled words of Cassideous to spell it correct.