From Eurfa Saesneg, English-Welsh Eurfa/Freedict dictionary ver. 0.2.3: cornerstones /kˈɔːnəstˌəʊnz/ <n> conglfeini <n, p, m>
cornerstones /kˈɔːnəstˌəʊnz/ <n> conglfeini <n, p, m>