Osiers are a type of plant that belong to the willow family and are known for their flexible branches which are often used for weaving. When something is 'made of osiers', it is typically referring to an object or item that has been constructed using these branches. There are many synonyms for this phrase such as 'wicker', 'weaved', 'braided' or 'plaited'. Depending on the context, alternatives like 'basketry', 'cane', 'rattan', or 'reed' may also be used. Each term may refer to a slightly different method of weaving or construction, but all can be used in place of 'made of osiers' to describe objects that have been woven from these pliable natural materials.