Webster's English Dictionary

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phellogen

phel.lo.gen \'fel-*-j*n\ \.fel-*-j*-'net-ik\ \-'jen-ik\ n [Gk phellos + ISV 
   -gen] : a secondary meristem that initiates phellem and phelloderm in the 
   peride rm of a stem - phel.lo.ge.net.ic aj