Definition of "unmyelinated" [unmyelinated]

• Lacking a myelin sheath. Used of a nerve fiber. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The researchers found that the fibres, called unmyelinated low-threshold mechanoreceptors"
• "These unmyelinated, specialized nerve fibers, called C-tactile fibers, each cover about one square centimeter of skin."
• "Those sensations are coming via unmyelinated nerves, and give you some idea of the level of sensation in an embryo."