Houstellum or Haustellum: How To spell?

The word Houstellum is misspelled against Haustellum, a noun meaning "The sucking proboscis of various insects. See Lepidoptera, and Diptera."

Word contains consecutive vowels 'AU' in between alphabets h & stellum is misspelled as 'OU'
Wrong Spelling:  h-ou-stellum 
Correct Spelling:  h-au-stellum 
Check more misspelled words of Haustellum to spell it correct.

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