Hypocaast or Hypocaust: How To spell?

The word Hypocaast is misspelled against Hypocaust, a noun meaning "A furnace, esp. one connected with a series of small chambers and flues of tiles or other masonry through which the heat of a fire was distributed to rooms above. This contrivance, first used in bath, was afterwards adopted in private houses."

Word contains consecutive vowels 'AU' in between alphabets hypoc & st is misspelled as 'AA'
Wrong Spelling:  hypoc-aa-st 
Correct Spelling:  hypoc-au-st 
Find more incorrect spellings of Hypocaust to spell right way.

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