The English language is usually a pretty useful tool. Most of us don't have too much trouble finding a word to describe what we're talking about.
But it's a rapidly changing world in which we live, and ideas often come along that defy easy explanation. Like, say, the use of microscopic components to build machines, it's a concept called nanorobotics.
A new book by Lizzie Skurnick is about neologisms, names for things that didn't have names before.