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[luhm-bri-kuh l]
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noun Anatomy.
  1. any of four wormlike muscles in the palm of the hand and in the sole of the foot.

Origin of lumbrical

1685–95; < New Latin lumbrīcālis, literally, pertaining to a worm, equivalent to Latin lumbrīc(us) earthworm + -ālis -al1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018