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.
... does not always bring seeds upon a suitable nidus for germination, the primary essential of which is a sufficiency of moisture, and the duration of vitality of the embryo is a point of interest. Some seeds retain vitality for a period of many years, though there is no warrant ... — Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 • Various
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