Definitions

1. proper noun

An American mathematician and computer scientist who developed the Backus normal form and the Backus-Naur form in formal language theory.

“John is a great admirer of John Backus, who revolutionized programming languages.”

2. noun

A type of backusite, a mineral found in the United States and Australia.

“Geologists have discovered a new deposit of backusite in the Australian outback.”