'Sidewall' in the Bible

Then he is to sprinkle some of the blood from the sin offering on the sidewall of the altar. Now as to the remainder of the blood, he is to pour it out at the base of the altar for a sin offering.

And the width of the doorway [was] ten cubits, and the sidewall of the doorway {was five cubits on each side}, and he measured its length [as] forty cubits, and [its] width [was] twenty cubits.