Hardening of the arteries

What is Hardening of the arteries?

Hardening of the arteries definition and meaning on Dictionary terms:
noun
a woolly-leaved North American shrub, Spiraea tomentosa, of the rose family, having short, spikelike clusters of rose-colored flowers.
shrubby cinquefoil.

 

reference: https://www.dictionary.com/browse/hardening-of-the-arteries

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