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The prefix stereo- seems to make things either three-dimensional, as in stereophonic or -scopic, or else one-dimensional, as in a stereotype. What gives?

The truth is actually somewhere in between. The modern English prefix stereo- comes from the Greek στερεος, which means "solid." Here's how the two, seemingly very different senses came about.

In the late 1700s, printers invented a money- and time-saving expedient they called "stereotype." Here's how the OED explains it:

The method or process of printing in which a solid plate o[f] type-metal, cast from a papier-mâché or plaster mould taken from the surface of a forme of type, is used for printing from instead of the forme itself.

That is, instead of printing a page using loose type, assembled character-by-character and line-by-line, they discovered they could make a cast of the entire page and print with that. This method freed up the extremely valuable loose type for use in other jobs. And the whole page was cast in a single, solid piece; hence the invention of the prefix stereo- to indicate the solid (versus loose) block of type.

Although this was a technical innovation with several important advantages, it also had disadvantages, especially the resulting difficulty (or even impossibility) of making corrections or changes to the text. Imagine it: if you need to add a word or line earlier in a book, every single page that follows is already cast in solid blocks.

This difficulty of making fine-tuned adjustments gave rise to our metaphorical sense of stereotype. Whenever you lump people all together and can't make adjustments to any individual because you don't see them as separate elements but as a single, solid whole, you're stereotyping.

The later-nineteenth-century development of stereoscopic and stereophonic are much more straightforwardly connected to the original sense of the Greek. The stereoscope and its stereographs got their names from the illusion of solidity provided by their three-dimensional views (and likewise for stereophonic sound effects). Here stereo- doesn't mean "solid" as opposed to "loose" but as opposed to "flat."

So it's merely an accident of English etymology that one stereo- seems to mean "flat" and the other "not flat."

first published Sep 18, 2004