photoplethysmographWiktionary 原文英美构词拆解photophoto-前缀plethysmographplethysmograph词干photo-light, electromagnetic radiation · photography词源说明From photo- + plethysmograph.释义名词noun1A plethysmograph that uses illumination of the skin in order to measures changes in light absorption同族词相关词 1photoplethysmogram