e·co·tone 
(ēkə-tōn′, ĕkə-)
(ēkə-tōn′, ĕkə-)n.
A transitional zone between two communities containing species characteristic of each.
[ECO- + Greek tonos, tension, tone; see TONE.]
- stock company
- stock dividend
- stock dove
- stocker
- stock exchange
- stockfish
- stock footage
- stockholder
- stockholding
- Stockholm
- Stockholm syndrome
- stockily
- stockiness
- stockinet
- stockinette
- stocking
- stocking cap
- stockinged
- stocking mask
- stocking stuffer
- stock-in-trade
- stock in trade
- stockist
- stockjobber
- stockjobbing