Wordnet 3.0
NOUN (1)
1.
the branch of zoology that studies the behavior of animals in their natural habitats;
The Collaborative International Dictionary of English v.0.48:
Ethology \E*thol"o*gy\, n. [Gr. ? a depicting of character; ?
custom, moral nature + ? to speak.]
1. A treatise on morality; ethics.
[1913 Webster]
2. The science of the formation of character, national and
collective as well as individual. --J. S. Mill.
[1913 Webster]
WordNet (r) 3.0 (2006):
ethology
n 1: the branch of zoology that studies the behavior of animals
in their natural habitats