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| a chattering or flighty, light-headed person. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| biotite (bī'ə-tīt') Pronunciation Key
A dark-brown or dark-green to black mica. Biotite is monoclinic and is found in igneous, metamorphic, and sedimentary rocks. Chemical formula: K(Mg,Fe)3(Al,Fe)Si3O10(OH)2. |