My Office 97 Bookshelf Dictionary gives two meanings - wheat. It thinks colour is spelt that way but notes color also legal, esp in Nth America. It says spelled or spelt (and gives almost identical definition as below). (OE crashes if I paste from MS reference programs - always has on every OS and every OE version).
My big paper dictionary (it has a 13 long word title) gives two also, the above wheat one and how I use it. It makes no note of it NOT being a US word (and it does note British, Chiefly British (means us Commonwealth countries), or country specific (Americian, Australian, NZ - not seen any canadian spellings in any dictionary, ever). It's an "altternative (to what? ) past tense and past participle of spell".
Do canadians even have their own words?
Now I can put those glasses away and avoid paper things for a while longer.