Webster's English Dictionary

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septum

Cross references:
  1. dissepiment           
 
sep.tum \'sep-t*m\ \-t*\ n or sep.ta [NL, fr. L saeptum enclosure, fence, 
   wall, fr. saepire to fence in,] pl  fr. saepes fence, hedge; akin to Gk 
   haimasia stone wall : a dividing wall or membrane