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psi (2)
psi particle
psia
psid
psig
psilocin
psilocybin
psilomelane
psilophyte
psilopsid
psittacine
psittacosaurus
psittacosis
PSL
PSNCR
PSNI
psoas
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psilophyte
psi·lo·phyte [ slə ft ] (plural psi·lo·phytes)


noun 
Definition:
 
1. paleontology extinct primitive plant: a primitive leafless vascular plant of the Silurian period with a horizontal stalk that grew beneath the ground sending up short vertical stems
2. plants 
Same as  whisk fern
[Early 20th century. < Greek psilos "smooth" + phyton "plant"]
Encarta® World English Dictionary [North American Edition] © & (P)2008 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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