cuniculus

noun
cu·​nic·​u·​lus | \ kyü-ˈnik-(y)ə-ləs How to pronounce cuniculus (audio) \
plural cuniculi\ -​ˌlī, -​ˌlē How to pronounce cuniculi (audio) \

Medical Definition of cuniculus

: the burrow of an itch mite in the skin