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Definition of Pentabasic
1. a. Capable of uniting with five molecules of a monacid base; having five acid hydrogen atoms capable of substitution by a basic radical; -- said of certain acids.
Definition of Pentabasic
1. Adjective. (chemistry) (''of an acid'') containing five replaceable hydrogen atoms ¹
2. Adjective. (chemistry) (''of a salt'') having five atoms of a univalent metal ¹
¹ Source: wiktionary.com
Medical Definition of Pentabasic
1.