What is "percurrent"

Percurrent \Per*cur"rent\, a. [L. percurrens, p. pr. of percurrere to run through; per through + currere to run.] Running through the entire length.

a. (context botany English) Running through the entire length; running through from top to bottom, as the midrib of a dicotyledonous leaf, the nerve of a moss-leas, or a grass-palet, etc.