A veil worn by Muslim women to cover parts of the face when they are in public.
1930, Sax Rohmer, The Day the World Ended, published 1969, page ix. 88:
Through her gauzy yashmak I could see that she was smiling.
1982, TC Boyle, Water Music, Penguin, published 2006, page 46:
Mungo cannot make out her face, which is concealed behind a yashmak – the double horsehair veil worn by Muslim women in public – but he is immediately struck by her feet and hands.