barbituric acid (the organic acid compound)

sourness (quality or condition) / (chemistry) acid

(organic chemistry) an organic compound

sour / (chemistry) acid

Alternative spelling of 酢 (“vinegar”)

(chemistry) a chemical compound

a seed / a pit or stone in a fruit / a gamete (reproductive cell such as a spermatozoan or egg) / a lineage, bloodline / an origin, cause / the materials or ingredients from which something is made

(biochemistry) aspartic acid

(organic chemistry) carboxylic acid

acetylsalicylic acid