1.  trilby(n = noun.person) - singer in a novel by George du Maurier who was under the control of the hypnotist Svengali;
is a kind of character, fictional character, fictitious character

2.  trilby(n = noun.artifact) fedora, felt hat, homburg, stetson - a hat made of felt with a creased crown;
is a kind of chapeau, hat, lid

trilby, n. (pl. -ies) Brit. a soft felt hat with a narrow brim and indented crown.

Derivative:
trilbied adj.

Etymology:
name of the heroine in G. du Maurier's novel Trilby (1894), in the stage version of which such a hat was worn