4. (Science: geometry) a curve or surface which is tangent to each member of a system of curves or surfaces, the form and position of the members of the system being allowed to vary according to some continuous law. Thus, any curve is the envelope of its tangents. 4. A set of limits for the performance capabilities of some type of machine, originally used to refer to aircraft. Now also used metaphorically to refer to capabilities of any system in general, including human organizations, especially. In the phrase push the envelope. It is used to refer to the maximum performance available at the current state of the technology, and therefore refers to a class of machines in general, not a specific machine. Push the envelope increase the capability of some type of machine or system; usu. By technological development.
Origin: f. Enveloppe.
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... present mainly in the mesophyll tissues in the leaves. Each cell of mesophyll has 20-100 chloroplasts. Chloroplast has double membrane envelops that encloses a dense fluid filled region called stroma, which contains most of the enzymes required to produce carbohydrate molecules. Another ...
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