noun. A genus of coniferous trees of the tribe Abietineæ, known by the staminate flowers in numerous short yellowish catkins, and the two forms of leaves, the primary small and scale-like, the secondary long and conspicuous and in clusters of from one to five each, enveloped at the base by a dry sheath.

noun. [lowercase] Same as pineal body (which see, under pineal).

noun. A large genus of evergreen coniferous trees, mostly found in the northern hemisphere. The genus formerly included the firs, spruces, larches, and hemlocks, but is now limited to those trees which have the primary leaves of the branchlets reduced to mere scales, and the secondary ones (pine needles) acicular, and usually in fascicles of two to seven. See pine.

noun. type genus of the Pinaceae: large genus of true pines

"The pinus strobus or white pine is subject to attack of the pith borer which attacks the young growth."

gymnosperm genus  

pine