Straighten, as With Hair Tools
This page is the CodyCross answer for the clue below from Physics, Group 1895, Puzzle 4 (Subatomic Particles).
Question is: Straighten, as With Hair Tools
and the answer is: UNCURL
Word Meaning:
UNCURL — (transitive, intransitive) To straighten out from being curled up.
Definitions from Wiktionary.