Peribothron

The point of least distance of an object orbiting a black hole. Similarly perihelion is the point of least distance of an object orbiting the Sun and perigee that of the Earth. The term was suggested by William R. Stoeger in 1976 and the first ones to use it in a publication were Sir Martin Rees and Juhan Frank (1976). The term is derived from the Greek word βόθρος (vóthros), which means a pit in ancient Greek – especially one used in religious rites or to collect waste. In modern Greek the word means a cesspit of sink. The prefix comes also from Greek. Peri (περί) means the word 'near'.

Source: Frank J., Rees M. J. 1976, Monthly Notices of the Royal Astronomical Society, 176, 633: Effects of Massive Central Black Holes of Dense Stellar Systems.

See further information on bothroses in these sources::
Barringer J. M. 2014, The Art and Archaeology of Ancient Greece, Cambridge  University Press
Pendlebury J. D. 1969, The Archaeology of Crete, Biblo & Tannen Publishers
Vaag L. E., Nørskov V., Lund J. 2003, Forum Archaeologiae 28/IX/2003:  Pottery from the Maussolleion at Halikarnassos