Nidus 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.
... appear to prevent fecundation are: First, the absence of the proper nidus for the ovum; second, the obstruction of the cervical canal by a mucus plug; third, increased alkalinity of the cervical secretion, often accompanied by the increased acidity of the vaginal secretion. Three conditions must, then, be determined: First, ... — The Four Epochs of Woman's Life • Anna M. Galbraith
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