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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a chattering or flighty, light-headed person. |
| microorganism (mī'krō-ôr'gə-nĭz'əm) Pronunciation Key
An organism that can be seen only with the aid of a microscope and that typically consists of only a single cell. Microorganisms include bacteria, protozoans, and certain algae and fungi. See Note at germ. |
Organisms so small that they can be seen only through a microscope. (See bacteria, protozoa, and viruses.)