It's often quite easy to guess what words mean.
Take the horrible word sinusoidal, for instance. It clearly means to do with the sinuses.
The only trouble with that is that actually the horrible word sinusoidal has nothing at all to do with the sinuses.
If you're a mathematician or a physicist you'll already know that something sinusoidal follows a path that looks like this:
That's a sine wave. They're important, but if you're not a mathematician or a physicist then you probably aren't aware of bumping into them much.
Fortunately that means that very nearly all of us have no reason whatsoever to use the word sinusoidal.
So let's all give thanks for that.
Word Not To Use Today: sinusoidal. This word comes from the Latin word sinus, a bend.