Lots of Hebrew words end in " -im" Shittim is one.
"feminine of a derivative (only in the plural shittiym
{shit-teem'}; meaning the sticks of wood) from the
same as 'shotet' (7850); the acacia (from its scourging
thorns):--shittah, shittim. See also 'Beyth hash-Shittah'
(1029
Reminds me of ancient joke about cowboy and Indian going to hotel. Next morning room service
found cowboy on 'the best seat in the house", with an arrow through his heart. The Indian
confessed. "Me do it. Tribal law. He shittim in spring."