One man's convexity is another man's concavity. Be sure to put the food to be cooked into the concave side.
Dr. Bill your definitions strike me as rather bowlderized. [ducks and runs for cover]
If it quacks like a duck, it is a duck.
What rhetorical device is this?
We learned way back in high school many, many years ago the mnemonic:
concave = take a flat surface; curve it inward to make a little cave
convex = take a flat surface; curve it outward to make a sexy breast (Edit: vex rhymes with sex)
My best friend in high school and I would look at our sorely-developing little chests and bemoan the fact that we were concave and not convex.
The meaning has stuck with me for almost four decades, so something in the mnemonic must have worked!
Dear WW: Not exactly a figure of speach. A mnemonic.
Curves and spaces in all the right places.
Omitting limerick about young man from Racine.