abstract idea

an idea or concept that has no specific material referent, such as justice, or one that applies to a great many particular instances, having a meaning apart from any particular, such as dog. See also universals.

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Psychology term of the day

November 16th 2024

simple eye

the type of eye found in most vertebrates and some invertebrates. It consists of a single focusing element, which may be a thickening of the exoskeleton (in an arthropod), a pinhole in the surface of the eye (in a mollusk), or a crystalline lens (in a vertebrate), plus one or more photosensitive cells. Compare compound eye.