The Collaborative International Dictionary of English v.0.48:
Amalgamate \A*mal"ga*mate\, v. t. [imp. & p. p. Amalgamated;
p. pr. & vb. n. Amalgamating.]
1. To compound or mix, as quicksilver, with another metal; to
unite, combine, or alloy with mercury.
2. To mix, so as to make a uniform compound; to unite or
combine; as, to amalgamate two races; to amalgamate one
race with another.
Ingratitude is indeed their four cardinal virtues
compacted and amalgamated into one. --Burke.