Acid

• (chemistry) A substance that produces H⁺(aq) ions in aqueous solution. Strong acids ionize completely or almost completely in dilute aqueous solution. Weak acids ionize only slightly.
• (biology) A substance that dissociates, releasing hydrogen (H⁺) ions but not hydroxyl (OH^-) ions; whose aqueous solution has a pH less than 7. Source: Curtis, Helena. 1968. Biology. New York, NY. Worth Publishers

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