IPA: /ɑːrˈθrældʒɪk/
KK: /ɑrˈθræl dʒɪk/
Relating to pain in the joints.
After the long hike, she felt arthralgic pain in her knees.
Arthralgic is formed from "arthro-" (from Greek "arthron", meaning joint) and "algic" (from Greek "algos", meaning pain). The word describes a condition characterized by pain in the joints.
Think of 'arthro-' referring to a 'joint' and 'algic' meaning 'pain' — that's why arthralgic means relating to joint pain.