Definition of aulacogen in English:

aulacogen

Pronunciation /ɔːˈlakədʒ(ə)n/

noun

Geology
  • A narrow, sediment-filled rift valley which is thought to be the remnant of an incipient rift that failed to open further, typically one that initially formed a triple or quadruple junction with other rifts that developed fully.

Origin

1960s. From Russian avlakogen (N. S. Šatskij 1960) from ancient Greek αὖλακ-, αὖλαξ furrow (from the same Indo-European base as Old Church Slavonic vlěšti, Lithuanian vilkti to pull, to drag) + Russian -o- + -gen.