Anionotropic refers to the ability of a molecule or ion to interact with negatively charged particles. Synonyms for anionotropic include anion-selective, anion-sensing, anion-responsive, and anion-binding. These terms describe the same concept of molecules or ions interacting with anions in different ways and to varying degrees. The choice of synonym depends on the specific context and the level of interaction being described. For instance, anion-binding may refer to the simple physical attraction between an anion and a molecule, while anion-selective or anion-sensing may refer to more complex interactions involving specific functional groups or biological systems. Using different synonyms for anionotropic allows scientists and researchers to describe and understand the interaction of anions in greater detail.