section perpendicular to the axis of longitudinal growth.
Merriam-Webster Online Dictionary
cross section (noun)1.
a) a cutting or piece of something cut off at right angles to an axis , also a representation of such a cutting
b) - section
2.
a measure of the probability of an encounter between particles such as will result in a specified effect (as scattering or capture)
3.
a composite representation typifying the constituents of a thing in their relations
cross section (Wikipedia)

Look up cross section in Wiktionary, the free dictionary.
Cross section may refer to:
- Cross section (geometry)
- Cross-sectional views in architecture & engineering 3D
- Cross section (geology)
- Cross section (electronics)
- Radar cross section, measure of detectability
- Cross section (physics)
- Cross Section (album), 1956 musical album by Billy Taylor