gymnosperm


gym·no·sperm

noun \ˈjim-nə-ˌspərm\

Definition of GYMNOSPERM

:  any of a group of vascular plants that produce naked seeds not enclosed in an ovary, that were formerly considered a class (Gymnospermae) of seed plants, but that are now considered polyphyletic in origin and divided into several extinct divisions and four divisions with surviving members typified by the cycadophytes, conifers, ginkgo, and ephedras — compare angiosperm
gym·no·sper·mous \ˌjim-nə-ˈspər-məs\ adjective
gym·no·sper·my \ˈjim-nə-ˌspər-mē\ noun

Origin of GYMNOSPERM

ultimately from Greek gymnos + sperma seed — more at sperm
First Known Use: circa 1838

gym·no·sperm

noun \ˈjim-nə-ˌspərm\   (Medical Dictionary)

Medical Definition of GYMNOSPERM

: any of a class or subdivision (Gymnospermae) of woody vascular seed plants (as conifers or cycads) that produce naked seeds not enclosed in an ovary and that in some instances have motile spermatozoids—compare angiosperm
gym·no·sper·mous \ˌjim-nə-ˈspər-məs\ adjective

gymnosperm

noun    (Concise Encyclopedia)

Any woody plant that reproduces by means of a seed (or ovule) in direct contact with the environment, as opposed to an angiosperm, or flowering plant, whose seeds are enclosed by mature ovaries, or fruits. The four surviving gymnosperm divisions are Pinophyta (order Pinales, the most widespread), Cycadophyta (order Cycadales), Ginkgophyta (order Ginkgoales), and Gnetophyta (order Gnetales). More than half are trees; most of the rest are shrubs. Gymnosperms occur on all continents except Antarctica and especially in the temperate latitudes. Those widely found in the Northern Hemisphere are junipers, firs, larches, spruces, and pines; in the Southern Hemisphere, podocarps (Podocarpus). The wood of gymnosperms is often called softwood to differentiate it from the hardwood of angiosperms. Many timber and pulp trees are also planted as ornamentals. Gymnosperms also are a minor source of food; of essential oils used in soaps, air fresheners, disinfectants, pharmaceuticals, cosmetics, and perfumes; of tannin, used for curing leather; and of turpentines. Gymnosperms were a major component in the vegetation that was compressed over millions of years into coal. Most are evergreen. They produce male and female reproductive cells in separate male and female strobili (see cone).

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