Ol

Olbers Paradox
If the Universe is infinite, uniform, and unchanging then the entire sky at night would be bright, about as bright as the Sun.
Oldham Coupling
A double slider connection used to connect shafts which have only lateral misalignment.
OLED
Abbreviation of Organic Light Emitting Diode.
Oleoresin
A natural plant product that contains oil and resins, an example is turpentine.
Olf
An empirical unit of indoor odor intensity.
Oligocene
The geological period covering about 35.5 million years ago to 23.5 million years ago.
Olive Oil
Obtained from the fruit of Olea Europaea.