Etymology
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nidus (n.)

"nest, breeding place," especially the case or cell formed by an insect or spider for reception of its eggs, 1742, from Latin nidus "a nest," from Old Latin *nizdus (see nest (n.)). Figurative use by 1807. Classical plural is nidi.

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Definitions of nidus

nidus (n.)
a central point or locus of an infection in an organism;
Synonyms: focus / focal point
nidus (n.)
a nest in which spiders or insects deposit their eggs;
From wordnet.princeton.edu