tether
1. teth.er \'teth-*r\ n [ME tethir, prob. of Scand origin; akin to ON
tjo-thr tether; ak]in to OHG zeotar pole of a wagon 1: something (as a rope
or chain) by which an animal is fastened so that it can range only within
a set radius 2: the limit of one's strength or resources : SCOPE {the end
of h is ~}
2. tether \-(*-)rin\ vt or teth.er.ing : to fasten or restrain by or as if
by a tether
Webster's English Dictionary