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The Collaborative International Dictionary of English v.0.48 (gcide)

Steganography \Steg`a*nog"ra*phy\
(st[e^]g`[.a]*n[o^]g"r[.a]*f[y^]), n. [Gr. stegano`s covered
(fr. ste`gein to cover closely) -graphy.]
1. The art of writing in cipher, or in characters which are
not intelligible except to persons who have the key;
cryptography.
[1913 Webster]

2. Specifically: The branch of cryptography in which messages
are hidden inside other messages; -- used commonly for the
process of hiding messages inside a computerized image
file, as for example hiding the name and copyright notice
of the owner of an image as protection against violation
of the copyright.
[PJC]