IPA: /ˌhaɪdrəˈmæʃɪdʒ/
KK: /haɪdroʊˈmæsaʤ/
A type of massage that uses water jets and bubbles to provide a soothing and therapeutic experience for the person receiving it.
After a long week, I treated myself to a hydromassage at the spa.
Hydromassage is formed from "hydro-" (from Greek "hydor", meaning water) and "massage" (from French "massager", meaning to knead or handle). The word refers to a massage technique that uses water to provide therapeutic benefits.
Think of 'water' ('hydro-') being used to 'knead' or 'handle' ('massage') the body, which is what hydromassage is all about.
No commonly confused words.