chiaroscuro
Concise Oxford English Dictionary © 2008 Oxford University Press:
chiaroscuro /kɪˌɑːrəˈskʊərəʊ/
▶noun the treatment of light and shade in drawing and painting.
– origin C17: from Ital., from chiaro ‘clear, bright’ + oscuro ‘dark, obscure’.
'chiaroscuro' also found in these Oxford entries:

