time crystal

== English == === Etymology 1 === Coined by American biologist Arthur Winfree in 2001. An analogue to crystals, which have repetitive patterns in space. ==== Noun ==== time crystal (plural time crystals) (biology) A periodic biological system. === Etymology 2 === Coined by American physicist Frank Wilczek in 2012. An extension of the concept of a crystal to encompass time. ==== Noun ==== time crystal (plural time crystals) (quantum mechanics) A crystal that has a structure that repeats not only in space, but also in time.