proem /prōˈem/

1. An introduction
2. A prelude
3. A preface

proemial /prō-ēˈmi-əl/ adjective

• oceanography
• oceanological
• oceanologies
• oceanologist
• oceanologists
• oceanology
• ocean perch
• ocean perches
• oceans
• ocean-stream
• ocean-streams
• ocellar
• ocellate
• ocellated
• ocellation
• ocellations
• ocelli
• ocellus
• oceloid
• ocelot
• ocelots
• OCF
• och
• oche
• ocher