gegenschein
Concise Oxford English Dictionary © 2008 Oxford University Press:
gegenschein /ˈgeɪgənˌʃʌɪn/
▶noun Astronomy a patch of very faint reflected light sometimes seen in the night sky opposite the position of the sun.
– origin C19: Ger. Gegenschein, from gegen ‘opposite’ + Schein ‘glow, shine’.
'gegenschein' also found in these Oxford entries:

