Elementary (A2)
IPA: /nɒnˈæsɪd/
KK: /nɑnˈæsɪd/
Definition
Describing something that does not have acidic properties or content.
Example
The nonacid solution is safe to use on sensitive skin.
Conversation

I tried that new smoothie place yesterday, and they have a nonacid option.

Oh really? I usually avoid smoothies because they can be too tangy for me.

Yeah, this one was great — refreshing and smooth, without any acidic bite.

I need to check it out then; a nonacid smoothie sounds perfect!
Synonyms & Antonyms
Definition
A substance that does not have acidic properties and is not classified as an acid.
Example
Water is considered a nonacid because it does not have a sour taste and does not react with litmus paper.
Conversation

Did you know that vinegar is actually an acid, but there are many nonacid options for cooking?

Really? I always thought all cooking ingredients had to be acidic.

Not at all! There are plenty of nonacid ingredients like oils and some herbs.
Root Explanation
Nonacid → It is formed from "non-" (meaning not) and "acid" (from Latin "acidus", meaning sour or sharp). The word "nonacid" means not sour or lacking acidity.
Memory Tip
Think of 'not' ('non-') and 'sour' ('acid') to remember that 'nonacid' refers to something that is not sour.