From The Collaborative International Dictionary of English v.0.48 [gcide]:
Note: Applied to some substances, it is equivalent to indurate; as, metallic matter concretes into a hard body; applied to others, it is equivalent to congeal, thicken, inspissate, coagulate, as in the concretion of blood. "The blood of some who died of the plague could not be made to concrete." --Arbuthnot.
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