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pseudoscorpion
pseudosophistication
pseudotuberculosis
pseudovector
psf
Psge
pshaw
PSHE
psi (1)
psi (2)
psi particle
psia
psid
psig
psilocin
psilocybin
psilomelane
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psi (1)
psi [ sī, psī ] (plural psis)


noun 
Definition:
 
23rd letter of Greek alphabet: the 23rd letter of the Greek alphabet, represented in the English alphabet as "ps"
[15th century. < Greek psei]
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