nigra truo

== Esperanto == === Pronunciation === IPA(key): /ˈniɡra ˈtruo/ Syllabification: ni‧gra tru‧o === Noun === nigra truo (accusative singular nigran truon, plural nigraj truoj, accusative plural nigrajn truojn) (astronomy) black hole == Ido == === Pronunciation === IPA(key): /niˈɡratruo/ === Noun === nigra truo (plural nigra trui) black hole