thumbnail

Etymology

From thumb + nail. The phrase thumbnail sketch was first attested 1852. Verb sense attested 1930s.

noun

  1. The fingernail on the thumb.
  2. A rough sketch (e.g., the size of one's thumbnail).
  3. (chiefly computing) A small picture, used as a compact representation of a larger image.

verb

  1. (transitive) To describe concisely.
  2. (transitive, computing) To create a smaller representation of (a larger image).

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