‘Precious Artifact’ is a short story by Philip K. Dick that I read recently in the collection The Golden Man (Methuen, 1981). I won’t get into the story here, or the book, except to lend context to a phrase he coined for it. But if you’re averse to mild spoilers, skip ahead a little.
The phrase is introduced when the protagonist, based on Mars, is preparing to return to Earth, or Terra as it’s called in the story:
Milt Biskle said, “I want you to do something for me. I feel too tired, too—” He gestured. “Or depressed, maybe. Anyhow I’d like you to make arrangements for my gear, including my wug-plant, to be put aboard a transport returning to Terra.”
Milt’s singling out the wug-plant is significant both narratively (for reasons I’ll ignore) and emotionally: he’s attached to it to the point of calling it a pet. Later, on ‘Terra’, he finds it has not prospered in the new climate (‘my wug-plant isn’t thriving’), and soon afterwards ‘he found his Martian wug-plant dead’.
But wug-plant is most significant linguistically. Those of you with a background or interest in linguistics will know why, but for the benefit of other readers I’ll explain briefly.