analog

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analog

 [an´ah-log]
pertaining to an electronic system in which a continuous electrical signal is used to carry nonelectrical information (such as sound), which is represented by variations in the voltage or current that are in direct correlation to the information carried. See also digital.

analog

or

analogue

(ăn′ə-lôg′, -lŏg′)
n.
1. Biology An organ or structure that is similar in function to one in another kind of organism but is of dissimilar evolutionary origin.
2. Chemistry A structural derivative of a parent compound that often differs from it by a single element.
adj.
Of, relating to, or being a device in which data or a signal is represented by continuously variable, measurable, physical quantities, such as length, width, voltage, or pressure.

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.

analogue

Chemistry
noun A compound that is structurally similar to another.

Imaging
adjective An MRI term referring to or having a continuous range of values.

Informatics
adjective Referring to data in the form of continuously variable (non-discrete) physical quantities, the mode in which most lab instruments produce information, where data is generated as non-discrete signals, as in AC or DC current, voltage changes or pulse amplitudes.

Molecular biology
adjective Referring to a molecule that is structurally and functionally related to another molecule.

noun A molecule that is structurally and functionally related to another molecule.    

Pharmacology
noun A therapeutic agent with structural or chemical similarity to, or which mimics the effects of, another agent, but which differs chemically.

an·a·logue

, analog (an'ă-lawg)
1. One of two organs or parts in different species of animals or plants that differ in structure or development but are similar in function.
2. A compound that resembles another in structure but is not necessarily an isomer; analogues are often used to block enzymatic reactions by combining with enzymes.
[G. analogos, proportionate]

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.
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