acidus (opposed to dulcis: sour to taste or smell). (The words are found in this connection and order), acer acidusque. Somewhat acid, acidulus, subacidus. Very acid, acidissimus, peracerbus, acerbissimus, peracer, acerrimus: malum acidum = an apple sour, though ripe; malum acerbum, an apple sour, because unripe. To be acid, acere, acidum, or acerbum, or acrem esse gustatu. To be turning acid, acescere, coacescere. Vid: SOUR.