an ancient measure of length, approximately equal to the length of a forearm. It was typically about 18 inches or 44 cm, though there was a long cubit of about 21 inches or 52 cm 肘尺(一种古代长度单位,大约为前臂的长度,一般18英寸或44厘米,长肘尺为21英寸或52厘米)
语源
Middle English: from Latin cubitum 'elbow, forearm, cubit'