Acidic

Part of speech: adjective

Pronunciation: /əˈsɪdɪk/

Definitions

  1. Having a sour taste or chemical properties of an acid, with a pH value below 7
  2. Characterized by a sharp or sour flavor, a tendency to donate protons in chemical reactions, and a pH level lower than 7
  3. Describing substances that possess sourness, have the ability to increase hydrogen ion concentration, and measure below 7 on the pH scale

Etymology: The adjective describing a sour or sharp taste, often applied in chemistry and everyday language to denote substances with a pH less than 7, derives from the root word "acid." This root entered English from the Latin "acidus," meaning "sour" or "sharp," which in turn traces back to the Proto-Indo-European root *ak-, meaning "sharp" or "pointed." The Latin term itself was used to describe tastes like those of vinegar or citrus fruits. The suffix "-ic" appended to "acid" is a common English and scientific ending borrowed from Latin and Greek, typically used to form adjectives indicating a relationship or pertaining to something. Thus, adding "-ic" to "acid" creates an adjective meaning "of or relating to acid," which came into regular use in English by the early 17th century as chemistry began to develop as a formal science. While "acidic" initially described the sensory experience of sourness, its meaning expanded through the 18th and 19th centuries alongside advances in chemistry. It came to denote not just taste but the chemical property of substances capable of donating protons or accepting electrons, following the definitions by chemists like Svante Arrhenius and later Brønsted and Lowry. The shift from a purely sensory descriptor to a precise scientific term illustrates how language adapts to new knowledge. Today, the word conveys both everyday and technical meanings, bridging common experience and scientific understanding. Its formation is a straightforward example of English's tendency to build adjectives by adding familiar suffixes to Latin-derived roots.

Synonyms: sour, tart, sharp

Antonyms: basic, alkaline, sweet