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Pi is (probably) an abbreviation for a Greek word meaning "perimeter" or "periphery" ... the original source is not exactly clear.
Turbitity
The question is not altogether clear, but in a question such as What is x% of y? (where x and y are numbers), y is the original value. Incidentally, since x% of y is the same as y% of x, it does not matter all that much.
Not clear if this is about the word ‘rule’, or about something called the word rule.
This question is not clear. Calculating sums of a list of numerical values is called addition. The sum of a single list of related lists is called sub total. Finding the sum of all sub totals is called grand total.
Navigable
a vessel that is open or clear of obstruction
One that's open & clear of obstruction
You can return a product from carol wright gifts by posting it back in it's original packaging with the name and address of the business in clear writing.
Navigable
a cleaning rod
I like to use a plastic zip tie to poke around in the hole to clear the obstruction.
Cleaning rod or woooden dowl
If more conservative approaches fail to clear the obstruction, surgical procedures are available, with success rates greater than 90%.
Clear is one that I could think of. Feel free to expand."After her surgery to remove a bowel obstruction, her intestines were clear."
Original
to clear the obstruction to aqueous outflow from the eye, which in turn lowers the intraocular pressure (IOP).