tetrastichous

[ti-tras-ti-kuhs]

te·tras·ti·chous

[ti-tras-ti-kuhs]
adjective Botany.
1.
arranged in a spike of four vertical rows, as flowers.
2.
having four such rows of flowers, as a spike.

Origin:
1865–70; < Neo-Latin tetrastichus < Greek tetrástichos having four lines or rows. See tetra-, stich1, -ous
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Tetrastichous is always a great word to know.
So is archegonia. Does it mean:
male reproductive structure which produces gametes in ferns, mosses, fungi and algae
female reproductive organ which produces eggs in bryophytes, ferns and most gymnosperms
Collins
World English Dictionary
tetrastichous (tɛˈtræstɪkəs)
 
adj
(of flowers or leaves on a stalk) arranged in four vertical rows

Collins English Dictionary - Complete & Unabridged 10th Edition
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