Mid 19th century. From ancient Greek ἀλγησις sense of pain (from ἀλγεῖν to feel pain (from ἄλγος pain: see -algia) + -σις) + -ia, after French algésie or German Algesie; probably also influenced by analgesia.
Definition of algesia in US English:
algesia
nounalˈdʒiːzɪə
Medicine
The sensation or perception of pain.
Origin
Mid 19th century. From ancient Greek ἀλγησις sense of pain (from ἀλγεῖν to feel pain (from ἄλγος pain: see -algia) + -σις) + -ia, after French algésie or German Algesie; probably also influenced by analgesia.