ParenthesEs is the plural, parenthesIs is the singular.
Normally I don't do the spelling/grammar thing, but it was consistently wrong in the article, and at least a half dozen comments here were getting it wrong, too, so I figured a public service announcement was in order.
Normally I don't do the spelling/grammar thing, but it was consistently wrong in the article, and at least a half dozen comments here were getting it wrong, too, so I figured a public service announcement was in order.