Clustrum or Claustrum: How To spell?

The word Clustrum is misspelled against Claustrum, a noun meaning "A thin lamina of gray matter in each cerebral hemisphere of the brain of man."

Word contains consecutive vowels 'AU' in between alphabets cl & strum is misspelled as 'U' as letter 'A' is phonetically ignore
Wrong Spelling: cl-u-strum
Correct Spelling: cl-au-strum
Check more misspelled words of Claustrum to spell it correct.