Hastellum or Haustellum: How To spell?

The word Hastellum 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 'A' as letter 'U' is phonetically ignor
Wrong Spelling: h-a-stellum
Correct Spelling: h-au-stellum
Check more misspelled words of Haustellum to spell it correct.