IPA: /pləˈkeɪtəri/
KK: /pləˈkeɪtəri/
Having the ability to calm someone down or make them feel better, especially after they are upset or angry.
She offered a placatory smile to ease the tension in the room.
Placatory → It is formed from "placare" (meaning to soothe or calm) and the suffix "-ory" (meaning relating to or characterized by). The word "placatory" means relating to the act of soothing or calming someone, often in a conciliatory manner.
Think of the word 'placate' which means to soothe or calm someone, and remember that 'placatory' describes something that is meant to do just that.