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Cross section   /krɔs sˈɛkʃən/   Listen
noun
cross section  n.  
1.
A flat plane cutting through a three-dimensional object, usually at right angles to the longest axis of the object.
2.
Any visual representation of a cross section 1, showing the internal structure of the object in the plane of the cross section; as, the technician prepared a series of MRI cross sections of the skull. Note: Different cross sections created by different techniques may show different aspects of internal structure. Thus computerized axial tomography using X-rays shows different structures than are visualized by MRI.
3.
A thin slice of an object made by cutting it transversely; as, to view a cross section of a bacterium with an electron microscope after staining the DNA; cross sections were prepared with a microtome.
4.
A representative sample of a complex group; as, the town contained a cross section of the American population.
5.
(Physics) A measure of the probability that a nucleus will interact in a specified way with a bombarding particle, expressed as the effective area that the nucleus presents to the particle; called also nuclear cross section.


verb
cross section  v. t.  To create one or a series of cross sections 3 by cutting (an object) into thin slices.





Collaborative International Dictionary of English 0.48


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"Cross section" Quotes from Famous Books



... drill too deep. Make each hole just deep enough so that the connector will come off easily. Fig. 192 shows a cross section of a post and connector drilled to the proper depth. Notice that you need not drill down the whole depth of the connector, because the bottom part is ...
— The Automobile Storage Battery - Its Care And Repair • O. A. Witte
... the air. These always burst on percussion. The constant noise of our own guns is really worse on the nerves than the shell; there is the deafening noise, and the constant whirr of shells going overhead. The earth shakes with every nearby gun and every close shell. I think I may safely enclose a cross section of our position. The left is the front: a slope down of 20 feet in 100 yards to the canal, a high row of trees on each bank, then a short 40 yards slope up to the summit of the trench, where the brain of the outfit was; then a telephone wired ...
— In Flanders Fields and Other Poems - With an Essay in Character, by Sir Andrew Macphail • John McCrae
... which people met to consider together their basic dependence upon fire and warmth, had a curious challenge of life about them. Because the cooperators knew what it meant to bring forth children in the midst of privation and to see the tiny creatures struggle for life, their recitals cut a cross section, as it were, in that world-old effort—the "dying to live" which so inevitably triumphs over poverty and suffering. And yet their very familiarity with hardship may have been responsible for that ...
— Twenty Years At Hull House • Jane Addams
... a perspective of the piston itself, or the "spider," with its follower and its rings removed, which are shown in Fig. 2. Fig. 3 is a cross section of another form of the piston, to be presently described, but which will serve to explain that shown in Figs. 1 and 2. Next to the core of the spider are two narrow internal rings, A, in Figs. 1 and 3; surrounding these two outer rings, B, the cross section ...
— Scientific American, Vol. 17, No. 26 December 28, 1867 • Various


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