Oxer

A single fence composed of two or three parts to produce a spread, or width, effect. A "square" oxer is equal in height in both the front element of the spread and the back.
Found on http://www.georgianindex.net/horse_and_carriage/horse-glossary.html

oxer

An oxer is a type of fence. It is two jumps that you jump as one. The spread (area between the two fences) can very from half a foot to 6 feet, depending how experienced you are!
Found on http://members.tripod.com/~Hayley_C/glossary.html

oxer

Horse jumping term often used in agility to denote a double-bar spread jump.
Found on http://budhouston.wordpress.com/a-glossary-of-dog-agility-terms/

Oxer

Parallel bar-type fence with two rails A square oxer has even rails A step or ascending oxer has a lower front rail
Found on http://www.gaitedhorses.net/Articles/HorseGlossary.html

Oxer

Single fence consisting of two elements which make a spread jump
Found on http://worldclasshorseshows.com/show-jumping-101/glossary-of-terms/
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