im·pe·ri·a 
(ĭm-pîrē-ə)
(ĭm-pîrē-ə)n.
Plural of imperium.
- hydrosulfide
- hydrosulfite
- hydrosulfurous acid
- hydrotactic
- hydrotaxis
- hydrotherapy
- hydrothermal
- hydrothermally
- hydrothermal vent
- hydrothorax
- hydrotropic
- hydrotropism
- hydrous
- hydroxide
- hydroxide ion
- hydroxy
- hydroxyapatite
- hydroxybutyric acid
- hydroxychloroquine
- hydroxyl
- hydroxylamine
- hydroxylate
- hydroxylation
- hydroxylic
- hydroxyl ion