macamba - tropical American feather palm having a swollen spiny trunk and edible nuts
Sounds more like a macaw entwined with a mamba to me. (venomous tree snake with a fatal bite)
macarism - the practice of making others happy through praise and felicitation
It's really the worship of macaroni and cheese.
Meatus - A body opening or passage, such as the opening of the ear or the urethral canal
This meatus rotten, I tell ya.
See you tomorrow for strange N words!