ForestrypediaLexicon of Forestry (LoF)

O | Lexicon of Forestry

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Occlusion: The process of healing of cut branch stubs by the cambium of the surrounding stem surface.

Ocean: [13th century. Via French and Latin < Greek ōkeanos, the river surrounding the disk of the Earth] a large expanse of salt water, especially any of the Earth’s five main such areas, the Atlantic, Pacific, Indian, Arctic, and Antarctic oceans. The oceans occupy huge regions of the Earth’s surface, and their boundaries are usually established by continental land masses and ridges in the ocean floor.

Old field: An area of cleared open land no longer used for cultivation or pasture which may be in the process of reverting to forest.

Old growth: A forest that has never been changed by management or harvesting. This term is misapplied by many to describe any forest that appears to be old. Individual trees in this type of forest are usually over 200 years old, and there are large standing and fallen dead trees throughout the stand.

Oleo resin: These are sticky, amorphous semisolids that contain essential oils. Among the oleoresins are the balsam, dragon’s blood, and copaiba; turpentine is possibly the most widely used oleoresin. (See: Resin)
On The Stump: Standing, uncut timber.
Opening up: Considerable reduction of canopy density, e.g., by lopping, felling, or herbicidal treatment of selected trees, or naturally through pests, disease, or drought mortality.

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Operation: Used interchangeably for logging jobs, harvesting, cutting, milling, etc. An all-inclusive term for harvesting and hauling out the forest products.
Optimum stocking: See stocking: optimum

Organic: [15th century. Directly or via French < Latin organicus < Greek organikos “of an organ, instrumental” < organon “tool, instrument”] belonging to a family of compounds that have chains or rings of carbon atoms linked to atoms of hydrogen and sometimes oxygen, nitrogen, and other elements

Orientation: The art if placing a building in such a position so that its from faces a particular direction
Outplant: Planting nursery-grown tree seedlings on a freshly prepared area. (See transplant).
Over-all application: See broadcast application

Overgrazing.  Grazing so heavy that it impairs future forage production and causes range deterioration through damage to plants, soil, or both.

Overmature: A quality exhibited by trees that have declined in growth rate because of old age and loss of vigor.

Overmaturity: That period in the life cycle of trees and stands when growth or value is declining. (See maturity).

Overplanting: See fill planting

Overrun: The excess lumber sawn from logs over the estimated volume or log scale, usually expressed in percent of log scale.

Overstocked: A condition of the stand or forest, indicating more trees than desired, normal, or full stocking would require.
Overstory: That portion of the trees is a stand forming the upper crown cover.
Overstory removal: A final harvest in which the cutting releases advance regeneration.
Overtopped crown class: See crown class: suppressed

Overtopped tree: Trees with crowns entirely below the general level of the overstory cover, receiving no direct light either from above or from the sides. (Syn. Suppressed). (See: crown class).

Oviparous: producing eggs that hatch outside body: describes birds, fish, reptiles, and insects that reproduce by means of eggs that develop and hatch outside the mother’s body.; relating to egg production outside body: relating to the production of eggs that develop and hatch outside the mother’s
Oviposition: The act of depositing the eggs.
Ovipositor: Tubular egg-laying organ: a tubular organ at the end of the abdomen of some female fish or other organisms, especially insects, that is used to deposit eggs
Ozone Layer: A region of the atmosphere from 19 to 48 km (12 to 30 mi) above Earth’s surface.

Corrections and Suggestions are most welcome. Please use the comment section for feedback. If you see any missing terminology or any updated one or any latest term please use the comment section for the purpose. Also, if you have any image or data related to any above terminologies, don’t forget to mail me at
Naeem Javid Muhammad Hassani

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Naeem Javid Muhammad Hassani is working as Conservator of Forests in Balochistan Forest & Wildlife Department (BFWD). He is the CEO of Tech Urdu ( Forestrypedia (, All Pak Notifications (, Essayspedia, etc & their YouTube Channels). He is an Environmentalist, Blogger, YouTuber, Developer & Vlogger.

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