free radical

Noun

 * 1)  A molecule, ion or atom that has one or more unpaired electrons, and which is generally highly reactive (and therefore often occurs only as a transient species).

Translations

 * Chinese:
 * Mandarin:
 * Finnish:
 * French:
 * Hungarian: szabad gyök
 * Indonesian: radikal bebas
 * Japanese:
 * Korean: 유리기(遊離基)
 * Portuguese:
 * Spanish: radical libre
 * Ukrainian: ві́льний радика́л
 * Vietnamese: gốc tự do