This one’s kind of gross, but it’s been a while since I did anything disgusting so I think it’s time. A bolus is the big old ball of food and spit that forms in your mouth while you’re chewing, just before you swallow it. I bet you’re picturing that now, right? Ewww.

The word itself comes from the Latin for ‘ball’ and you can also use it for other round stuff, if you really want to. ‘Bolus’ has a couple of other meanings as well – in medicine, it’s a dose of a drug, and in veterinary medicine it’s a large pill.

Don’t confuse it with ‘bolas’, which is a type of throwing weapon made from weights on the end of two ropes. You wouldn’t want to try to swallow one of those.