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The Collaborative International Dictionary
Orthostichy

Orthostichy \Or*thos"ti*chy\, n.; pl. Orthostichies. [Ortho- + Gr. sti`chos row.] (Bot.) A longitudinal rank, or row, of leaves along a stem.

Wiktionary
orthostichy

n. (context botany English) A row of leaf along a stem