Definition: nidus

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Source: WordNet (r) 1.7 

nidus
     n 1: a central point or locus of an infection in an organism;
          "the focus of infection" [syn: focus]
     2: a nest in which spiders or insects deposit their eggs

Source: Webster's Revised Unabridged Dictionary (1913) 

Nidus \Ni"dus\, n.; pl. nidi. [L. See Nidi, Nest.]
   A nest: a repository for the eggs of birds, insects, etc.; a
   breeding place; esp., the place or substance where parasites
   or the germs of a disease effect lodgment or are developed.