Linux's First Free Operating System Is a Bit Nutty
This page is the CodyCross answer for the clue below from Underground Worlds, Group 2170, Puzzle 1 (Crystals and Gems).
Question
Linux's First Free Operating System Is a Bit Nutty
Answer
KERNEL
Word Meaning:
KERNEL — The core, center, or essence of an object or system.
Definitions from Wiktionary.