A small portable keyboard which produces no sound when played, and which players of keyboard instruments use for practice and especially to exercise the fingers and wrists.
Origin
Mid 19th century; earliest use found in The Times. From digit + -orium.
Definition of digitorium in US English:
digitorium
nounˌdɪdʒɪˈtɔːrɪəm
A small portable keyboard which produces no sound when played, and which players of keyboard instruments use for practice and especially to exercise the fingers and wrists.
Origin
Mid 19th century; earliest use found in The Times. From digit + -orium.