noun \ˈnī-dəs\
plural ni·di \-ˌdī\ or ni·dus·es

Definition of NIDUS

: a place where something originates or is fostered or develops; specifically : the point of origin or focus of an infection or disease process

Seen & Heard

What made you want to look up nidus? Please tell us where you read or heard it (including the quote, if possible).