πῆχυν [2 verses] (noun sg masc acc )"Cubit" is from pechys, "which means "forearm", "arm", "the centerpiece joining the two horns of the bow", "horns of the lyre", "crosspiece or bridge of a horn", "balance beam," and "distance from the point of the elbow to that of the middle finger," which was a little of 20 inches. -- The word translated as "cubit" means "forearm," which is the measure of length used in a cubit, which is 1 1/2 ft., 18 inches. So we have a conflict here between a measure of length, 18 inches, being added or applied to a measure of age. This is why some Bibles translate this phrase as adding inches to a height, others adding time to our lives.