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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
fractionation frac·tion·a·tion (frāk'shə-nā'shən)
n.
The process of dividing or separating into parts; breaking up.
The division of a total therapeutic dose of radiation into small doses to be administered over a period of days or weeks.
The separation of a chemical compound into components, as by distillation.
| fractionation (frāk'shə-nā'shən) Pronunciation Key
The separation of a chemical compound into components by fractional crystallization or fractional distillation. |