This is a word to give pleasure in every saying: orifice (you say it ORRY-fiss).
It means an opening, of course. Orifices of the body, for example, are the mouth, the nostrils and...er...various others.
Back orifice is a sneaky bit of computer programing which means you can operate a computer secretly and remotely. This can be useful, obviously, but it can also be a dangerous menace and the security people hate it.
An orifice plate is a clever device which partly blocks off a pipe through which a fluid is passing. The difference in pressure as the fluid goes through the left-open bit - the orifice - tells you stuff about the flow rate.
Or so they tell me - though that sort of stuff goes in one orifice and out the other, I'm afraid.
Word To Use Today: orifice. This is too wonderful a word not to be used as often as possible, and there are orifices everywhere. Think of nesting boxes and post boxes and washing machines, for a start.
Do explore one today.
The word orifice comes from the Late Latin ōrificium, and before that from the Latin ōs, mouth, and facere, to make.