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From Biology-Online Dictionary | Biology-Online Dictionary
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1. The state or quality of being nebulous; cloudiness; hazeness; mistiness; nebulousness. The nebulosity . Of the mother idiom. (I. Disraeli)

2. (Science: astronomy) The stuff of which a nebula is formed. A nebula.

Origin: L. Nebulositas: cf. F. Nebulosite.