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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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| ABC (aerial bundle cable) |
system of reducing the physical hanging space of aboveground electrical conductors.
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| abiotic |
nonliving.
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| abiotic disorder |
plant malady caused by nonliving, environmental, or man-made agents.
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| abscisic acid (ABA) |
plant hormone that stimulates stomatal closure and promotes seed and bud dormancy. Inhibits shoot growth but may promote root growth. Plays a role in wounding responses and in abscission of leaves and fruit.
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| abscission |
leaf or fruit drop induced by hormonal changes.
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| abscission zone |
area at the base of the petiole where cellular breakdown leads to leaf and fruit drop.
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| absorbing roots |
fine, fibrous roots that take up water and minerals. Most absorbing roots are within the top 12 inches (30 centimeters) of soil.
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| absorption |
taking up. Contrast with adsorption.
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| acceleration |
rate of change of the velocity of an object. Acceleration is a vector quantity. See vector and velocity.
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| access line |
(1) second climbing line hung in a tree in case it is needed to reach a victim in an emergency. (2) climbing line installed in a tree to gain access to, but not used to work, the tree.
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| access route |
defined entrance and exit route for a property during construction, tree work, or landscape operations.
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| acclimation |
physiological adaptation process of plants and other living organisms to a climate or environment different from their native environment or where originally grown.
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| acid |
having a pH less than 7.0. Contrast with alkaline.
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| acidity |
state or quality of being acid. Contrast with alkalinity. See pH.
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| actinomycetes |
group of soil bacteria resembling fungi. Actinomycetes play a role in the decomposition of organic matter and the release of mineral elements.
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| action |
pertaining to carabiners and snaps, the number of distinct motions for the gate to be opened. A nonlocking carabiner is single action, requiring one movement for the gate to be opened.
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| acuminate |
term describing leaves that taper sharply at their tip (apex).
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| acute |
disorder or disease that occurs suddenly or over a short period of time. Contrast with chronic.
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| adaptability |
genetic ability of plants and other living organisms to adjust or acclimate to different environments.
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| adjustable balancer |
adjustable rigging sling used to balance limbs in rigging operations.
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