A soothing, usually mucilaginous or oily substance, such as glycerin or lanolin, used especially to relieve pain in inflamed or irritated mucous membranes.

• 润滑剂，缓和剂一种起润滑作用的物质，例如甘油或羊毛脂等，通常是粘液或油状的，尤用于减轻因粘膜发炎而引起的疼痛