Pronunciation: (thum'nāl"),[key] —n. 1. the nail of the thumb.
2. anything quite small or brief, as a small drawing or short essay.
3. Print.a small, rough dummy.
4. Also called porkchop.Journ.,Print.a half-column portrait in a newspaper.
—adj. quite small or brief; concise: a thumbnail description of Corsica.
—v.t. to make a thumbnail sketch or description of.