n.
Pronunciation: ' path- ˌ w ā , ' päth-
Function: noun
Date: 15th century
1 : PATH , COURSE
2 : a line of communication over interconnecting neurons extending from one organ or center to another also : a network of interconnecting neurons along which a nerve impulse travels
3 : the sequence of usually enzyme-catalyzed reactions by which one substance is converted into another <metabolic pathway s >