Ozone

Ozone, is an allotropic form of oxygen, from which it can be developed by electricity, and into which it can be resolved by heat, present in small quantities in the atmosphere, and possessing strong oxidising properties.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Oyer and Terminer * Pache, Jean
Owens College
Oxenford, John
Oxenstiern, Axel, Count
Oxford
Oxford School
Oxford University
Oxfordshire
Oxus
Oxygen
Oyer and Terminer
Ozone
Pache, Jean
Pachomius, St.
Pachydermata
Pacific Ocean
Packhard
Pactolus
Pacuvius
Padang
Paderewski, Ignace Jan
Padilla, Juan Lopez de