namaskar
Concise Oxford English Dictionary © 2008 Oxford University Press:
namaskar /ˌnʌmʌsˈkɑː/
▶noun a traditional Indian gesture of greeting, made by bringing the palms together before the face or chest and bowing.
– origin via Hindi from Sanskrit namaskāra, from namas ‘bowing’ + kāra ‘action’.
'namaskar' also found in these Oxford entries:

