Both Uses

neutron
in
The Hitchhiker's Guide to the Galaxy
(Auto-generated)

"But are you not," he said, "a more fiendish disputant than the Great Hyperlobic Omni-Cognate Neutron Wrangler of Ciceronicus Twelve, the Magic and Indefatigable?"†
Chpt 25 *

neutron = a stable particle that is a component of all atomic nuclei, has 0 charge, and mass about equal to a proton
"The Great Hyperlobic Omni-Cognate Neutron Wrangler," said Deep Thought, thoroughly rolling the r's, "could talk all four legs off an Arcturan Mega-Donkey—but only I could persuade it to go for a walk afterward."†
Chpt 25

Definitions:

(1) (neutron)
a stable particle that is a component of all atomic nuclei, has 0 charge, and mass about equal to a proton
(2) (meaning too rare to warrant focus)