The word "girdered" is used to describe a structure that has girders, which are long and horizontal beams that support the weight of a building. Some synonyms for the word "girdered" include "beamed," "raftered," and "trussed." These words are commonly used to describe the construction of roofs, bridges, and other structures that require support beams. Another synonym for "girdered" is "framed," which refers to the process of creating a framework for a structure. Overall, these synonyms all refer to the same basic concept of using horizontal beams to support the weight of a structure and ensure that it remains stable and strong.