rɪˌtɪkjuˈleɪʃən
noun
the formation of a network of interconnected lines or fibers
Reticulation is often used in the context of plants to describe the pattern of veins in leaves, but it can also refer to any network-like structure. The word is derived from the Latin word 'reticulatus' which means 'made like a net.'
Dicotyledons Dicotyledonous Plants A class of plants characterised by having two seed-leaves, by the formation of new wood between the bark and the old wood (exogenous growth) and by the reticulation of the veins of the leaves.
Charles Darwin
The Origin of Species