[sahy, psahy] 
| 1. | the 23rd letter of the Greek alphabet (Ψ, ψ). |
| 2. | the group of consonant sounds represented by this letter. |
[sahy] | any purportedly psychic phenomenon, as psychokinesis, telepathy, clairvoyance, or the like. |
| pounds per square inch. |
| psi 1 (sī, psī, psē) n. The 23rd letter of the Greek alphabet. See Table at alphabet. [Middle English, from Late Greek, from Greek psei.] |
| psi 2 (sī) n. Parapsychological phenomena or abilities considered as a group. [Shortening and alteration of parapsychological.] |
| psi 3 abbr. pounds per square inch |
psi 1 (sī, psī)
n.
Symbol ψ The 23rd letter of the Greek alphabet.
| psi pounds per square inch |
