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Arboriculture Glossary of Terms
There are 1070 entries in this glossary.
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| Term | Definition |
|---|---|
| micronutrient |
essential element that is required by plants in relatively small quantities. Contrast with macronutrient.
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| micropore |
space between soil particles that is relatively small and likely to be water filled. Contrast with macropore.
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| micropulley |
small, light-duty pulley used in climbing operations. Often used as a knot tender.
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| midline loop |
looped knot formed or tied in the standing part of a line.
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| mineral |
naturally occurring, inorganic solid that has a definite chemical composition and possesses characteristic physical properties. Certain minerals are considered essential elements for tree growth and development.
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| minimum approach distance |
closest distance that a tree worker, tool, equipment, or tree part is permitted near overhead electrical conductors and equipment. Distance increases with increasing voltage and varies with training of personnel.
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| minimum breaking strength |
minimum load under which a new, unused rope or other piece of equipment will fail. Based on multiple trials and, for ropes, calculated as three standard deviations below the mean.
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| minimum irrigation |
practice of minimizing irrigation needs through the use of drought-tolerant plants and watering only when necessary. See Xeriscape.
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| mismatch cut |
cut type used in branch removal in which offset, overlapping cuts enable the section to be easily broken off. Snap cut. Bypass cut.
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| mites |
small, often minute, arthropods in the order Acarina of the class Arachnida that may feed on plants, other mites, or small insects.
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| mitigation |
in tree risk management, reducing, alleviating, or minimizing risk of harm (damage or injury).
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| mobile elevating work platform (MEWP) |
general term used primarily in the United Kingdom for mobile aerial platforms that are widely used on work sites in place of ladders and tower scaffolds.
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| moment |
rotational force that is created by any line force on a body. The magnitude of a moment is defined as the product of the force magnitude and the perpendicular distance from the line of action of the force to the axis that the moment is being calculated about.
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| monitoring |
keeping a close watch. Performing regular checks or inspections.
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| monocot |
see monocotyledon.
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| monocotyledon |
plant with an embryo that has one seed leaf (cotyledon). Examples are grasses and palms. Contrast with dicotyledon.
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| monoecious |
species with male and female flowers borne on the same plant. Contrast with
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| morphology |
study of the form and structure of plants and other living organisms. Contrast with anatomy, physiology, and taxonomy.
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| mortality spiral |
sequence of stressful events or conditions causing the decline and eventual death of a tree.
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| moving block |
in a mechanical advantage pulley system, the pulley that moves.
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