Meaning of “silhouette” - Learner’s Dictionary

silhouette

noun [ C, U ] uk us /ˌsɪluˈet/

the shape of something when the light is behind it so that you cannot see any details:

He saw a woman in silhouette.
silhouetted adjective

the roofs silhouetted against the night sky

(Definition of “silhouette” from the Cambridge Learner’s Dictionary © Cambridge University Press)