reversion The occurrence of a plant of particular qualities reverting back (losing those qualities) to the parent plant qualities.

revet The facing of stone, concrete, etc. against an embankment.

revetment A wall facing over an embankment to prevent erosion or cave-ins.

revolute In botanical terms, rolled backward, as the margins of many leaves.

RF, rf On drawings, an abbreviation for roof.

rfg Abbreviation for roofing.

RFI In construction, a request for information by a participant of work under contract on a project.

RFP Abbreviation for request for proposals.

RFQ Abbreviation for request for qualifications.

rgs Abbreviation for rigid galvanized steel.

rhiaomatous A plant that spreads by rhizomes.

rhizanthous Bearing flowers directly from the roots.

rhizobia Small heterotrophic soil bacteria capable of making symbiotic nodules on roots of some leguminous plants that became bacteroids fixing atmospheric nitrogen.

rhizobium A species of bacteria that live in symbiosis with some plant roots (usually legumes) by forming nodules on them and deriving their energy from the root while in return fixing atmospheric nitrogen for the plant and themselves.

rhizodegradation Contaminant breakdown due to influence of the rhizosphere of a root.

rhizoid A structure of a plant that is root-like, or a structure of root-like form and function but of simple anatomy, lacking xylem and phloem.

rhizome In botanical terms, any prostrate, more or less elongated stem growing partially or completely beneath the surface of the ground. They may be thick, hard, and sometimes rather large, or in many grasses and such they are sometimes delicate and hair-like. Thicker, larger ones are sometimes considered a type of bulb, with the thickened underground stem utilized for food storage. They creep horizontally from their tips (and other growing points form along their length) with roots generally growing from its underside. The buds on the rhizome produce roots, foliage, and flower stalks. Cutting portions of the rhizome with new growth buds and transplanting them can produce new plants.


rhizosphere The area of soil influenced by plant roots that shows more microbial numbers, species, and activity than other soil. In flooded soils with some plants the rhizosphere can be oxidized, resulting in the presence of aerobic soil in an otherwise anaerobic soil environment. The volume of soil adjacent to the root that is under the influence of the root.

rhomboid In botanical terms, a solid figure, rhombic (somewhat diamond shaped) in outline.

rhomboidal A botanical term meaning roughly diamond-shaped.

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