My understanding of it (and wikipedia seems to back me up) is that the term 'clip' when used properly refers to the device used to assist in loading a magazine.
For example, you use a clip to load ammunition into the (internal) magazine of an M1, and you could use a clip to load ammunition into a "banana clip", which actually refers to a style of magazine.
You're referring to "stripper clips" that were invented before guns had removable springed magazines. Those are a type of clip (and lead to the term), however the slang term clip doesn't refer to pistol magazines - it's merely slang for a magazine. It's a common misconception and what I was responding to.
In fact, the internal pistol magazine of a C96 pistol is still a magazine, but it loaded by a stripper clip, and some guns like the Japanese Type 3 are fed directly from stripper type clips - but those aren't "speedloaders" as the article suggests.(To juxtapose the concepts completely...)
I'm refering to the wikipedia article on ammunition clips in general: "A clip is a device that is used to store multiple rounds of ammunition together as a unit, ready for insertion into the magazine or cylinder of a firearm. This speeds up the process of loading and reloading the firearm as several rounds can be loaded at once, rather than one round being loaded at a time."
All I'm saying is "clip" doesn't mean "magazine for a pistol" - which is the misconception. Clip, as used commonly in slang, is for any magazine. Rarely would one refer to stripper clips as just "clips" - usually it's "stripper" or "strip" to avoid confusion.
For example, you use a clip to load ammunition into the (internal) magazine of an M1, and you could use a clip to load ammunition into a "banana clip", which actually refers to a style of magazine.