Residum or Residuum: How To spell?
The word Residum is misspelled against Residuum, a noun meaning "That which is left after any process of separation or purification; that which remains after certain specified deductions are made; residue."
Residuum has double "uu" is mispronounced as "u"Remember double 'UU' in between the strings resid & m which should not be misspelled with single 'U'
Wrong Spelling:  resid-u-m  Correct Spelling:  resid-uu-m 
Check more misspelled words of Residuum to spell it correct.