Tradle or Treadle: How To spell?

The word Tradle is misspelled against Treadle, a noun meaning "The chalaza of a bird's egg; the tread."

Treadle has vowels 'ea' together mispronounced as 'a'
Word contains consecutive vowels 'EA' in between alphabets tr & dle is misspelled as 'A'
Wrong Spelling:  tr-a-dle 
Correct Spelling:  tr-ea-dle 
Explore spell check of Treadle to spell without errors.

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