YOKE

A piece of wood or light frame of two arms, placed over the head of a boat's rudder instead of a; tiller, and having two lines {yoke lines), by pulling on: which the boat is steered. YTTRIUM The metallic base of an earth, dis- ' covered in 1794 by Profe or Gadolin in a mineral found at Ytterby in Sweden, whence it was called Yttria. j [s. 1351]