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Answer for the clue "Muscular twitching of contiguous groups of muscle fibers ", 13 letters:
fasciculation

Word definitions for fasciculation in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context anatomy muscles English) An involuntary muscle twitch, usually localised and temporary.

WordNet Word definitions in WordNet
n. muscular twitching of contiguous groups of muscle fibers

Wikipedia Word definitions in Wikipedia
A fasciculation , or muscle twitch , is a small, local, involuntary muscle contraction and relaxation which may be visible under the skin. Deeper areas can be detected by EMG testing, though they can happen in any skeletal muscle in the body. Fasciculations ...

Usage examples of fasciculation.

The fasciculations rapidly spread to other muscles until her body became wracked by clonic jerks.

Generalized muscular fasciculations then appeared, suggesting a hyperesthesia state.

It was the most likely explanation, except for one detail, Fasciculations do not migrate in waves.