Word root -ac- occurs in many Greek and Latin word parts: -acid-, -acerb-, -acri-, acet-, acetabul-, -acu-, -acanth-, etc. meaning "sharp, spine, spiney, thorny, acid, bitter, needle, sour". -ac- also occurs in medical and scientific word parts -acme-, acro-, and acromio-. (Yes, we're going to cover all these word parts in the near future.) [acid, from L. acere, to be sour, acerbic, lit. sharp, fig. sour or bitter in taste, acetic, lit. to be sour, fig. relating to vinegar, acrid, fig. harsh or bitterly pungent, acuity, fig. sharpness, acumen, acuteness of mind, acescence, lit. the state of becoming sour, acetabulum, lit. a shallow vinegar bowl, acanthesthesia, lit. feeling a thorn condition, acicular, lit. a small pin, acidosis, lit. acid condition, state, or process, aculeate, lit. having small spines, Acuaria spiralis, lit. needle animal group - spiraled]
blue emboldened words are common or college terms we can use for word association. reddish brown emboldened words are medical terms and should be looked up in a medical dicitionary for their figurative meanings.
Memory story: [Using the -ac- common to all the word parts listed:] "Ach" (-ac-) would be the sound you would make during numerous SS STABbiNgS (sharp, spine, spiney, thorny, acid, bitter, needle, sour) and also being made to drink acid and bitter solutions. [This memory story is a bit different then the one in my book. I think it's better.]
Now let's do the Bill of Rights' third amendment which is in regards to the quartering of soldiers. We're going to substitute the word "tree" for "three" in this memory story and for those who know Mnemonics' Link/Phonetic system the word "ma" is used.
Memory story: There's a bunch of British soldiers in your "tree" house and your "ma" is telling them to get out it. Of course, being the ever enterprising lady that she is, your ma tells them they can stay if they each come up with a quarter. Which is about ten cents more than you have invested in the place with all the found lumber and nails you used to build your tree house.
[This amendment doesn't seem that relevant today but prior to the Revolutionary War the British Army could come into your house, search it to insure all your documents and papers were stamped with the hated Stamp Act stamps, quarter their soldiers, make you feed them and their horses, and even throw you out of your house and use it for their own purposes. That's why it was felt important enough to be number three.]