Wiktionary
arabinoxylan
n. A hemicellulose found in the primary and secondary cell walls of plants, consisting of copolymers of arabinose and xylose.
Wikipedia
Arabinoxylan
Arabinoxylan is a hemicellulose found in both the primary and secondary cell walls of plants, including woods and cereal grains, consisting of copolymers of two pentose sugars – arabinose and xylose.