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{{RefAppeal}}

{{RefAppeal}}

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.

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.

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.

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