coupler
/ˈkʌplə(r)/noun
1- a thing that connects two things, especially mechanical components or systems（尤指机械部件或系统的）连接物; 连接器：
a hydraulic coupler
液力耦合器
as modifier coupler rod连接杆。
1.1
- Music a device in an organ for connecting two manuals, or a manual with pedals, so that they both sound when only one is played【乐】（风琴或管风琴的）联键音栓。
1.2
- Music （亦作octave coupler）a similar device for connecting notes with their octaves above or below【乐】八度联键音栓。
1.3
- Photography a compound in a developer or an emulsion which combines with the products of development to form an insoluble dye, part of the image【摄】耦合剂, 成色剂。
1.4
- （亦作 acoustic coupler）a modem which converts digital signals from a computer into audible sound signals and vice versa, so that the former can be transmitted and received over telephone lines声耦合器。