
A three or four legged stool with a back extending from the rear legs. Introduced in the late 16thC when the term 'chair' only applied to a seat with arms. Became known as a single or side chair in the 18thC.
Found on
http://www.antique-marks.com/antique-terms-b.html

An early form of armless chair introduced in the late 16thC. It is a three or four legged stool with a back extending from the rear legs. At the time, the word 'chair' only applied to seats with arms, and it was not until the early 18thC that the backstool became known as the single or a SIDE CHAIR.
Found on
http://www.encyclo.co.uk/visitor-contributions.php
No exact match found.