Having both acidic and basic characteristics. This is true of proteins since they have both acidic and basic side groups (the charges of which balance at the isoelectric point).
Dictionary of molecular biology. 2004.
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Amphoteric — Am pho*ter ic, a. [Gr. ? both.] Partly one and partly the other; neither acid nor alkaline; neutral. [R.] Smart. [1913 Webster] … The Collaborative International Dictionary of English
amphoteric — (adj.) neither acid nor alkaline, 1832, from Gk. amphoteros each or both of two, variant of AMPHI (Cf. amphi ) … Etymology dictionary
amphoteric — [am΄fə ter′ik] adj. [< Gr amphoteros, compar. of amphō, both; var. of amphi , AMPHI ] Chem. having both acid and basic properties … English World dictionary
amphoteric — adjective Etymology: International Scientific Vocabulary, from Greek amphoteros each of two, from amphō both more at ambi Date: circa 1849 partly one and partly the other; specifically capable of reacting chemically either as an acid or as a base … New Collegiate Dictionary
amphoteric — adj. [Gr. amphoteros, in both ways] 1. Possessing opposite characters. 2. Capable of acting either as a base or an acid … Dictionary of invertebrate zoology
amphoteric — /am feuh ter ik/, adj. Chem. capable of functioning either as an acid or as a base. [1840 50; < Gk amphóter(os) (comp. of ámpho both; c. L ambo) + IC] * * * … Universalium
amphoteric — adjective Having the characteristics of both an acid and a base, and capable of reacting as either; amphiprotic … Wiktionary
amphoteric — Having two opposite characteristics, especially having the capacity of reacting as either an acid or a base; e.g., Al(OH)3 Ξ H3AlO3 or an amino acid. [G. amphoteroi (pl.), both, fr. ampho, both] * * * am·pho·ter·ic .am(p) fə ter ik adj partly one … Medical dictionary
amphoteric — adj. functioning as both an acid and a base (Chemistry) … English contemporary dictionary
amphoteric — [ˌamfə tɛrɪk] adjective Chemistry able to react both as a base and as an acid. Origin C19: from Gk amphoteros, compar. of amphō both , + ic … English new terms dictionary