orthostichy(redirected from orthostichous)
Also found in: Dictionary, Encyclopedia.
- an imaginary vertical line connecting a row of leaves on a stem.
- the possession of parallel cartilaginous rays in the fins of fossil shark-like fish, such as Cladoselache.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005