an·a·log or an·a·logue (ănə-lôg′, -lŏg′)
1. Something that bears an analogy to something else; something that is comparable: “Titan, Saturn's giant moon … seems like an analog of the environment of Earth on the eve of life” (David Grindspoon).
2. Biology An organ or structure that is similar in function to one in another kind of organism but is of dissimilar evolutionary origin.
3. Chemistry A structural derivative of a parent compound that often differs from it by a single element.
1. 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.
2. Done, happening, or existing in the physical world rather than on an electronic device: analog strategy games; analog friendships.
[French analogue, analogous, analog, from Medieval Latin analogus, from Greek analogos, proportionate; see ANALOGOUS.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
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