Webster's English Dictionary

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lemniscus

lem.nis.cus \lem-'nis-k*s\ \-'nis-.(k)i-, -'nis-.ke-\ n or lem.nis.ci [NL, 
   fr. L, ribbon, fr. Gk le-mniskos] pl  : a band of fibers and esp. nerve 
   fibers