analog

analog or analogue (n-lôg)

n.

1. An organ or structure similar in function to one in another species but of dissimilar evolutionary origin.

2. A structural derivative of a parent chemical compound that often differs from it by a single element.

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analog

[an′əlog]

Etymology: Gk, analogos, proportionate

1 a substance, tissue, or organ that is similar in appearance or function to another but differs in origin or development, such as the eye of a fly and the eye of a human.

2 a drug or other chemical compound that resembles another in structure or constituents but has different effects. Also spelled analogue. Compare homolog. analogous, adj.

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analog, analogue

1. a part or organ having the same function as another, but of different evolutionary origin.

2. a chemical compound having a structure similar to that of another but differing from it in respect of a certain component; it may have similar or opposite action metabolically.