Something that heightens, increases, or intensifies; an agent or substance that makes something higher or stronger.
Formed from the verb 'heighten' plus the agent suffix '-er' (one who or that which does something), following standard English word formation patterns.
The word appears frequently in beauty product descriptions ('eyebrow heightener,' 'lash heightener') and cooking contexts, showing how English easily converts verbs into nouns describing tools or substances.
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