subcolumn

noun

subcolumn

noun

Etymology From sub- + column.

1

A column making up part of a larger column or supercolumn.

Now divide D into subcolumns and assume that radiation flows through each subcolumn independently of all other subcolumns[…]2007, Alex A. Kokhanovsky, Light Scattering Reviews: Remote sensing and inverse problems, page 10:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.