Ni·dus n.; pl. nidi 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.
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nidus
n 1: a central point or locus of an infection in an organism;
"the focus of infection" [syn: focus, focal point]
2: a nest in which spiders or insects deposit their eggs
[also: nidi (pl)]