Nidus

Nidus may refer to:

• In medicine, a point or place at which something originates, accumulates, or develops, as the center on which a tumor forms.
• Nest, for insects or small animals
• Locus of infection, the point on the body where a pathogen enters
• The natural reservoir for a pathogen
• The characteristic lesion in osteoid osteoma
• The centre of a bladder stone
• The material around which an enterolith forms
• The Nidus, a fictional magical object in the television series Into the Labyrinth