Using Spell Check
Ensure that your item title and description are free of misspelled words
Before you submit a listing, make sure that it looks professional by using eBay's spell check on your item description. The spell check button is located in the Description section of the Sell Your Item form.
When you click the button, the spell check will search for the first potentially misspelled word and automatically highlight it. You will see a list of suggested replacements for the misspelled word. You can change the word by selecting from the suggested replacements, change all other instances of the word on the page, ignore the suggestion, or ignore the suggestion for all instances of the word. The spell check will then highlight the next potentially misspelled word on the page.
Once spell check is complete, you can either save or cancel all your changes. Both actions will return you to the Sell Your Item form, where you can continue creating your listing.
More about Spell Check:
Available on the Sell Your Item, Revise Your Item, and the Relist and Sell Similar forms.
Can only be used if title and description are completed (subtitle optional).
Will not spell check HTML.
Spell check will only check the spelling of a word and not its formatting. For example, if you have used bold or italics on a word, the spell check will only show you the word in plain text. However, when you return to the Sell Your Item form after completing the spell check, your original formatting will be retained.
At this time you cannot use spell check to create your own custom dictionary.