The story
From New Delhi + metallo-beta-lactamase + 1. From its place of discovery, New Delhi, that it is a metallo-beta-lactamase, and that it is the first.
Etymology from Wiktionary, CC BY-SA 4.0.
New Delhi metallo-beta-lactamase-1
Today it means: An enzyme conferring resistance to beta-lactam antibiotics. Full definition →