Hysteresis

 Hysteresis is the dependence of the state of a system on its history. For example, a magnet may have more than one possible magnetic moment in a given magnetic field, depending on how the field changed in the past.

 

ace

 In baseball, an ace is the best starting pitcher on a team and nearly always the first pitcher in the team's starting rotation. Barring injury or exceptional circumstances, an ace typically starts on Opening Day. In addition, aces are usually preferred to start crucial playoff games, sometimes on three days' rest.

 

A baseball ace "Ian Kennedy"

chronozone

 A chronozone or chron is a unit in chronostratigraphy, defined by events such as geomagnetic reversals (magnetozones), or based on the presence of specific fossils (biozone or biochronozone). According to the International Commission on Stratigraphy, the term "chronozone" refers to the rocks formed during a particular time period, while "chron" refers to that time period.

 

Biostratigraphy

 Biostratigraphy is the branch of stratigraphy which focuses on correlating and assigning relative ages of rock strata by using the fossil assemblages contained within them.

 

Chronostratigraphy

 

Chronostratigraphy is the branch of stratigraphy that studies the ages of rock strata in relation to time. 

 

diopter

 diopter, in optics, unit of magnifying power of a lens or lens system.

 

nyctophilia

 

nyctophilia

n. a strong preference for darkness or night. Also called noctiphilia; noctophilia; scotophilia.