noun
eosinophil; acidophil
A type of white blood cell involved in allergic reactions and parasite defense. Used in medical and biological contexts.
好酸球はアレルギー反応に関与する白血球の一種です。
Eosinophils are a type of white blood cell involved in allergic reactions.
From 好 (こう, 'affinity for') + 酸 (さん, 'acid') + 球 (きゅう, 'cell'), referring to the cell's affinity for acidic dyes like eosin. The term is a calque from German 'eosinophil' or English 'eosinophil'.