A shape that can be repeated to cover a plane with a nonrepeating pattern.
A genius; a very smart person.
One mole of photons, regardless of frequency, as used to measure irradiance.
A two-dimensional image or animation that is integrated into a larger scene.
The green woodpecker, or yaffle (Picus viridis).
An electrical discharge that occurs high above the cumulonimbus cloud of an active thunderstorm.
An apparition; ghost
An elf; a fairy; a goblin.
A spayed female ferret.
Any of various African damselflies of the genus Pseudagrion (of which, Australian species are named riverdamsels).
A spirit; a soul; a shade.