freeburn means A surname.
Etymology
Variant of Freeborn.
noun
- An unconstrained fire.“Underwriters Laboratories Inc. 2 showed that rate-of-rise or rate-anticipating thermal detectors spaced as little as two feet or six feet directly above a 2½-square-foot alcohol fire, after a freeburn of 30 seconds, either did not detect at all within 30 seconds or, did so between 28 and 30 seconds.”