1) Lumbricalis 
• (n.) A lumbrical muscle. • (a.) Resembling a worm; as, the lumbrical muscles of the hands of the hands and feet.
Lum'bric·al adjective [ Confer French lombrical . See Lumbric .] (Anat.) Resembling a worm; as, the lumbrical muscles of the hands of the hands and feet. -- noun A lumbrical muscle. 
Type: Term Pronunciation: lŭm′bri-kăl Synonyms: lumbricoid1
lumbricus, worm.
Latin lumbricus = worm, hence worm-shaped muscles of the palm.
any of four wormlike muscles in the palm of the hand and in the sole of the foot.