straight-grained durable and often resinous white to yellowish timber of any of numerous trees of the genus Pinus
v.
have a desire for something or someone who is not present; ache, yearn, yen, languish
She ached for a cigarette
I am pining for my lover
Microsoft Computer Dictionary
n. Acronym for pine is not elm, or for Program for Internet News and E-mail. One of the most commonly encountered programs for reading and composing e-mail on character-based UNIX systems. The pine program was developed as an improved version of elm at the University of Washington. Compare elm.