fas·​ci·​cle ˈfa-si-kəl How to pronounce fascicle (audio)
: a small or slender bundle (as of pine needles or nerve fibers)
: one of the divisions of a book published in parts
fascicled adjective

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Fascicle, which has been a part of our language since the 15th century, is one of a bundle of words derived from Latin fascis, meaning "bundle." In book publishing, "fascicle" and its variants "fascicule" and "fasciculus" can all be used for one of the installments of a voluminous work; "fasciculus" can also be used for a bundle of anatomical fibers. "Fasciitis" is an inflammation of a "fascia," which is a sheet of tissue connecting muscles. You can also have a case of "fasciculation," or muscular twitching. Other descendants of "fascis" include "fasces" (a bundle of rods and an ax borne before ancient Roman magistrates as a badge of authority) and "fascine" (a long bundle of sticks of wood bound together).

Examples of fascicle in a Sentence

Recent Examples on the Web Over the course of several months, each fascicle would grow into the muscle, resupplying it with nerve signals. WIRED, 1 Aug. 2023 By placing an electrode into the little muscle-nerve bundle, scientists could record in real time which nerve signals were coming from each fascicle. WIRED, 1 Aug. 2023 These lie alongside each other to form the fascicle, or syntrophium, encased in the thickened outside cover, the labium. Popular Science, 20 Oct. 2020 These grow from a little cup-like structure called a fascicle, which grows from a small bud on the pine twig shoot. Tim MacWelch, Outdoor Life, 23 Dec. 2019 The deep core muscles, called the quadratus lumborum, psoas major, external oblique, and the deep fascicles erector spinae, attach directly to the lumbar vertebrae, and function primarily to stabilize the lumbar spine. David Becker, Philly.com, 28 Feb. 2018

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'fascicle.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


Latin fasciculus, diminutive of fascis

First Known Use

15th century, in the meaning defined at sense 1

Time Traveler
The first known use of fascicle was in the 15th century


Dictionary Entries Near fascicle

Cite this Entry

“Fascicle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fascicle. Accessed 19 Jul. 2024.

Medical Definition


fas·​ci·​cle ˈfas-i-kəl How to pronounce fascicle (audio)
: a small or slender bundle of anatomical fibers (such as muscle or nerve fibers) : fasciculus
fascicled adjective

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