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Meaning of end bulb

end' bulb"

Pronunciation: [key]
— Anat. Anat.
  1. any of various types of oval or rounded structures occurring at the ends of nerve fibers, ranging from slight enlargements to complex corpuscles that act as sensory receptors for pain, touch, cold, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.