Nidus

From Conservapedia - Reading time: 1 min

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A nidus (NEYE-dus) is a place or core for the development of something in nature. For example, the nidus of a pearl is the original core from which the pearl develops.

Nidus is often used as a figure of speech to refer to the essential core of something.

In psychiatry, a hallucination lacks a nidus in reality, but a delusion has one.