ə̇ˈrinēəm noun
( plural erin·ea -ēə ; or erineums )
Etymology: New Latin, from Greek erineon, eirineon, neuter of erineos, eirineos woolen, from erion, eirion wool, diminutive of eiros fleece
: an abnormal felty growth of hairs from the leaf epidermis of plants caused by various mites