peribothron

== English == === Etymology === From peri- +‎ Ancient Greek βόθρος (bóthros, “pit”) +‎ -(i)on. === Noun === peribothron (plural peribothra) (astronomy) The point in an elliptical orbit around a black hole where the orbiting body is closest to the black hole. ==== Synonyms ==== perimelasma perinigricon ==== Related terms ==== see periapsis