Merriam-Webster's Collegiate® Dictionary, 11th Edition
GOAD
I. noun
Etymology: Middle English gode, from Old English gād spear, goad; akin to Langobardic gaida spear, and perhaps to Sanskrit hinoti he urges on Date: before 12th century
1. something that pains as if by pricking ; thorn , something that urges or stimulates into action ; spur , a pointed rod used to urge on an animal, see: motive
II. transitive verb
Date: 1579
to incite or rouse as if with a goad, to drive (as cattle) with a goad