Polybasic

Part of speech: adjective

Definitions

1. Describing a chemical substance that contains multiple ionizable basic groups capable of accepting protons ; relating to compounds with several basic sites that can react with acids ; characterizing molecules that possess several distinct basic functional groups allowing multiple protonations
2. Referring to a compound featuring more than one basic functional group that can accept hydrogen ions ; indicating a substance with several bases sites for binding protons ; pertaining to chemicals with multiple proton-accepting centers capable of forming salts
3. Pertaining to molecules with numerous basic groups that can neutralize acids ; defining substances containing several protonatable nitrogen or other basic atoms ; concerning chemical species with multiple sites exhibiting basicity for acid-base reactions

Etymology: Chemists needed a way to describe molecules that can accept more than one proton, and "polybasic" was built for the job from two long-established pieces. The first, "poly-", comes from Ancient Greek "polús", meaning "many," and has been a productive prefix in English science for well over a century. The second, "basic," comes from "básis," the Greek word for a step, pedestal, or foundation, which passed through Latin "basis" and Old French "base" into Middle English. From there, "base" came to mean the part that supports, and in chemistry a substance able to neutralize an acid, the sense that gave rise to "basic." The adjective "basic" was formed from "base" with the Latin-derived suffix "-ic," so "polybasic" is simply "many-basic." The word is a plain technical coinage rather than an old term with a dramatic backstory. Its meaning follows the chemistry directly: a phosphoric acid, for example, can donate three protons, and the parallel idea on the basic side describes species with several sites that can take them up.

Synonyms: multibasic, multiple basic, polyprotic

Antonyms: monobasic, single basic, monoprotic