Something that improves or increases the quality, value, or extent of something else.
From enhance + -er, where 'enhance' comes from Anglo-Norman enhauncer, from en- 'in' + hancer 'to raise' (from Latin altus 'high'). The term gained scientific specificity in genetics, referring to DNA sequences that boost gene expression.
In genetics, enhancers are like volume knobs for genes - they can be located thousands of base pairs away from the gene they control yet still boost its activity! The word perfectly captures the idea of 'raising up' or elevating something's natural potential.
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