Entry 1 sense Webster, 1913 Lumbrical · Lum·bric·al · IPA /ˈlʌm.brɪk.əl/ 01 a. Resembling a worm; as, the lumbrical muscles of the hands of the hands and feet. 1. Resembling a worm; as, the lumbrical muscles of the hands of the hands and feet.(Anat.)