\TRAM-uhl\, noun: 1 A kind of net for catching birds, fish, etc 2 A kind of shackle used for making a horse amble 3 Something that impedes activity, progress, or freedom, as a net or shackle 4 An iron hook of various forms and sizes, used for handing kettles and other vessels over the fire 5 An instrument for drawing ellipses 6 An instrument for aligning or adjusting parts of a machine
a restraint that confines or restricts freedom (especially something used to tie down or restrain a prisoner)
An instrument for drawing ellipses, one part of which consists of a cross with two grooves at right angles to each other, the other being a beam carrying two pins (which slide in those grooves), and also the describing pencil