User blog comment:BertH/The Road to VisualEditor/@comment-2.25.18.80-20131029200428/@comment-5285329-20131030160749

Actually, you can use the term "wikia" ("W" not capitalized) to refer to a single wiki inside Wikia (the company) or as a plural, meaning that you can call them "a wikia" (singular to a wiki inside Wikia) or "all/a few wikia" (a bunch of wikis inside Wikia) as stated by Wikia (company :p) management.