pathway-n; 3 Senses

Sense Number 1: a trodden foot route, used for pedestrian travel

Commentary: PATHWAY[+structure][+physical][+route][+pedestrian][+trodden]
NOTE: refers to a usable, demarcated foot route

We followed a pathway through the woods to an old cabin.
It was a hidden underground pathway used by royalty for escape.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: a chain of nerve cells that can transmit electrical impulses

Commentary: PATHWAY[+structure][+physical][+anatomical][+chain][+cell][+nerve]
NOTE: refers to component neural structures of the nervous system anatomy.

The accident severed the neural pathway from the lower spine to the brain.
The brain contains very large and complex pathways of neurons.

WordNet 3.0 Sense Numbers: 2

Sense Number 3: a chain of enzyme_induced chemical reactions

Commentary: PATHWAY[+event][+sequence][+reaction][+chemical][+enzyme_induced]
NOTE: refers to a series of events

These metabolic pathways are not yet well understood by biochemists.
He is studying the metabolic pathways involved in converting starches into sugars.

WordNet 0.0 Sense Numbers: 1b