Reading a NY Times article by Shaila K. Dewan, I was brought up short by the first paragraph:
For more than a century, the fingerprint has been the quintessential piece of crime scene evidence. But fingerprints are only a tiny part of the story. All of a person’s “friction ridged skin” is distinctively patterned: soles, palms and even the writer’s palm, as the outer side of the hand is called.
The writer’s palm? Never heard of it, neither had my dictionaries, and “the outer side of the hand” didn’t make any sense to me. I googled “writer’s palm” and only got 27 hits, many of which simply refer to the palm of a writer (so it’s clearly not a very widespread term). I did, however, get two further definitions.
From a National Institute of Standards and Technology web page:
Larabee described the parts of the palm, emphasizing the importance of the “writers palm” which is the 4.45 cm (1.75 inch) by 12.7 cm (5.0 inch) area on the side of each palm opposite the thumb.
Not much better. But an IRS page has a nice clear definition: “The writer’s palm is that area on the side of the palm which normally rests against the paper when writing.” Isn’t it interesting how much more informative a plain-language definition can be than an ostentatiously scientific one?