Webster's English Dictionary

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neuron

neu.ron also neu.rone or neu.ron.ic \'n(y)u:-.ra:n, 'n(y)u.(*)r-.a:n\ 
   \-.ro-n, -.o-n\ \'n(y)u.r-*n-*l, n(y)u.-'ro-n-*l\ \n(y)u.-'ra:n-ik\ n [NL 
   neuron, fr. Gk, nerve, sinew - more at NERVE] : a grayish or reddish 
   granular cell with specialized processes that is th e fundamental 
   functional unit of nervous tissue - neu.ron.al aj