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Arboriculture Glossary of Terms
There are 1070 entries in this glossary.
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| Term | Definition |
|---|---|
| shock-loading |
dynamic, sudden force placed on a rope or rigging apparatus when a moving load or piece is stopped.
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| shoot |
stem or branch and its leaves, especially when young.
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| should |
word that designates an advisory recommendation in the ANSI standards or contract documents. Contrast with shall.
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| sieve cells |
long, slender phloem cells in gymnosperms.
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| sieve tube elements |
specialized phloem cells involved in photosynthate transport. Exist only in angiosperms.
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| sign |
physical evidence of a causal agent (e.g., insect eggs, borer hole, frass). Contrast with symptom.
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| silt |
soil particles with a grain size between 0.004 and 0.062 millimeter (coarser than clay particles but finer than sand). Contrast with clay and sand.
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| silviculture |
study and practice of the maintenance and growth of forests.
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| simple leaf |
single-bladed leaf. Not composed of leaflets. Contrast with compound leaf.
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| single action |
pertaining to carabiners and snaps, requiring one motion for the gate to open. A nonlocking carabiner is single action.
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| sink |
plant part that uses or stores more energy than it produces.
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| sinker roots |
downward-growing roots that provide anchorage and take up water and minerals. Especially useful during periods of drought.
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| sinus |
space between two lobes of a leaf. Contrast with lobe.
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| site analysis |
(1) consideration or evaluation of the conditions, restrictions, and environment of a planting site. (2) consideration or evaluation of a construction or development site requiring a tree conservation or preservation plan.
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| site considerations |
factors that must be taken into account when assessing a site for planting, tree conservation, or preservation or for any operation.
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| skeletonized |
leaf-feeding damage caused by insects (skeletonizers), characterized by the loss of tissue between the leaf veins.
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| slack tender |
any of several devices used to facilitate taking up slack in the climbing line.
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| sling |
device used in rigging to secure equipment or pieces being rigged.
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| slip knot |
slipped overhand knot.
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| slipped |
having a bight of rope passed through the final tuck in a knot to provide for quick release.
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