section perpendicular to the axis of longitudinal growth.

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

Cross section may refer to:

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