You spell it envelope.
This is how you spell "seal" in french: seal
Envelopes is correct.
envelope
seal
Didn't the English word 'envelope' come from French?
El sobre.
The corrected spelling (a typo?) is "envelope."
outstanding
It's a french word. (1705)
"Extrodinary" isn't actually a word. Although, the word "extraordinary" (if that's what you meant) basically means exceptional or unusual.
The phrase "how do you spell it in french" is spelled as "Comment cela s'épelle en français" in French.