Well, it turned out to be a conversation for which MRP was not really needed, but since I was suprised by the answer, I thought others might be interested, too.
Dear mighty red pen,
what is the correct terminology for a single word that has a capital letter in the middle of it, e.g. MacBook?
stumped in somerville
Well, I had no idea, but Stumped eventually wrote back and referred me to the Chicago Manual of Style, saying, “Not as interesting as I’d hoped.” Actually, I thought the answer was pretty interesting:
A word with a capital letter in the middle of it is said to have a “midcap”; such a word itself can also, by means of synecdoche, be referred to as a midcap. The name seems especially apt, given that corporations seem to be responsible for most such constructions. The word “midcap” does double duty in Standard & Poor’s MidCap 400—in which “MidCap” not only refers to a class of medium-sized companies but is itself a midcap.
Ooo, CMS made a funny at the end there, didn’t they?
In other totally-made-up word news, w00t (yes, those are zeros) was voted Merriam-Webster’s Word of the Year 2007.
Don’t look at me, I voted for blamestorm.