deglazing.com

Today’s daily definition comes from the fabulous food site Epicurious.com. 

Epicurious defines julienne as: “julienne [joo-lee-EHN, zhoo-LYEHN]
n . Foods that have been cut into thin, matchstick strips. The food (such as a potato) is first cut into 1/8-inch-thick slices. The slices are stacked, then cut into 1/8-inch-thick strips. The strips may then be cut into whatever length is desired. If the object is round, cut a thin slice from the bottom so it will sit firmly and not roll on the work surface. Julienne is most often used as a garnish. julienne v . To cut food into very thin strips.

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So a julienne can be either a verb or a noun, but is most commonly known as a matchstick dice.