Charcot-Leyden crystals

noun plural

Char·​cot-Ley·​den crystals ˌshär-ˌkō-ˈlī-dᵊn- 

: minute, colorless crystals found in bodily tissues or discharges (as of sputum or feces) that are released from eosinophils during degranulation and are indicative of an inflammatory response especially to parasitic infections or allergic states (such as asthma)