concretable
n.— «For the most part, portables don’t have the same stigma they did a few years ago. Before 2002, all the portables were the old wooden or metal-framed ones. Many are 30 or more years old. Today, about 560 portables are concrete modular varieties, resembling Monopoly houses. These buildings, often referred to as “concretables,” were built this decade and have the look and feel of a regular classroom.» —“School portables in demand” by Scott Travis Sun-Sentinel (Florida) Dec. 26, 2004. (source: Double-Tongued Dictionary)