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Meaning of orthostichy

or•thos•ti•chy

Pronunciation: (ôr-thos'ti-kē), [key]
— pl. -chies.
  1. a vertical rank or row.
  2. an arrangement of members, as leaves, at different heights on an axis so that their median planes coincide.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.