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Arboriculture Glossary of Terms
There are 1070 entries in this glossary.
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| Term | Definition |
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| D-rings |
D-shaped metal rings on a climber
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| DBH |
acronym for tree diameter at breast height. Measured at 1.4 meters (4.5 feet) above ground in the United States, Australia (arboriculture), New Zealand, and when using the Guide for Plant
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| DdRT |
acronym for doubled rope technique. Dynamic or static climbing system in which a rope is doubled over a branch and the climber utilizes both parts of the line. Contrast with DRT and SRT.
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| dead-end grips (tree grips) |
cable-termination devices that must be used to terminate extra-high-strength (EHS) tree support system cable to anchor hardware. May also be used with common-grade cable.
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| dead-end hardware |
lag-threaded cable anchor or bracing rod that is screwed directly into an undersized, pre-drilled hole in a tree but does not pass through to the other side. Contrast with through-hardware.
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| dead-eye sling |
rope sling with a single eye spliced in one end. Also called eye sling, fixed-eye sling, or spliced-eye sling.
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| deadwooding |
removing dead and dying branches from a tree. Outdated term for crown cleaning.
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| decay |
(1) (noun) an area of wood that is undergoing decomposition. (2) (verb) decomposition of organic tissues by fungi or bacteria.
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| deciduous |
tree or other plant that sheds all of its leaves according to a genetically scheduled cycle as impacted by climate factors (usually during the cold season in temperate zones). Contrast with evergreen.
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| decline |
gradually diminishing health or condition of a tree.
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| decline spiral |
see mortality spiral.
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| decurrent |
rounded or spreading growth habit of the tree crown. Contrast with excurrent.
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| deficiency |
pertaining to plant nutrition, lack or insufficient quantity of a required element.
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| defoliation |
loss of leaves from a tree or other plant by biological or mechanical means.
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| dehiscent |
splitting apart. Describes the release of seed capsules at maturity.
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| denitrification |
process of reducing nitrates to nitrogen gases.
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| dentate |
having serrations (teeth) perpendicular to the leaf margin and not pointed forward. Compare to serrate.
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| descender |
device used to control friction when descending a climbing line. Contrast with ascender.
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| desiccation |
severe drying out. Dehydration.
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| design criteria |
(1) aspects of the landscape or site and the required functions to be served by the plant that must be considered in plant selection. (2) factors considered in the design of equipment.
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