pla·cate 
(plākāt′, plăkāt′)
(plākāt′, plăkāt′)tr.v. pla·cat·ed, pla·cat·ing, pla·cates
To allay the anger of, especially by making concessions; appease. See Synonyms at pacify.
[Latin plācāre, plācāt-, to calm; see plāk-1 in the Appendix of Indo-European roots.]
placat′er n.
pla·cation (plā-kāshən) n.
placa·to′ry (-tôr′ē), placa′tive (-kā′tĭv) adj.