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1. the outer, protective, nonvascular layer of the skin of vertebrates.

2. the outer layer of cells of various invertebrates.

3. the outermost layer of cells covering the leaves and young parts of plants.

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Psychology term of the day

February 26th 2024



n. red–green color blindness in which the deficiency is due to absence of the cone photopigment sensitive to green light, resulting in loss of green sensitivity and confusion between red and green (see dichromatism). The condition may be unilateral (i.e., color vision may be normal in one eye). See also protanopia.