| 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 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 |