aponigricon

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It's a recognised English word, but it isn't in the official NASPA Scrabble word list.

Definition of aponigricon

1 sense · 1 part of speech · etymology included

noun

(uncountable)Apoapsis around a black hole.

“Indeed, the speed of, say, S2 at perinigricon is as large as 2.6 per cent of the speed of light, while at aponigricon it is 0.1 per cent of c.”
“Fig. 1 indicates that close encounters are negligible at aponigricon and for inclinations in the range 60–90° in both prograde and retrograde orbits.”

Definitions from Wiktionary, CC BY-SA.

From apo- + Latin niger (“black”) + -icon, alternative form of -ion.

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