Medical Dictionary
2acid
noun
Medical Definition of ACID
1
: a sour substance; specifically : any of various typically water-soluble and sour compounds that in solution are capable of reacting with a base to form a salt, that redden litmus, that have a pH less than 7, and that are hydrogen-containing molecules or ions able to give up a proton to a base or are substances able to accept an unshared pair of electrons from a base
2
: lsd
Seen & Heard
What made you want to look up acid? Please tell us where you read or heard it (including the quote, if possible).