The Collaborative International Dictionary
Impastation
Impastation \Im`pas*ta"tion\, n. [F. See Impaste.] The act of making into paste; that which is formed into a paste or mixture; specifically, a combination of different substances by means of cements.
Wiktionary
impastation
n. 1 The act of making into paste. 2 That which is formed into a paste or mixture; specifically, a combination of different substances by means of cements.