1. A branch of biology that deals with the form and structure of animals and plants; especially, with respect to the forms, relations, metamorphoses, and phylogenetic development of organs apart from their functions.
2. The study of the form and structure of an organism considered as a whole; especially, the physical shape and size of a specimen, plant, or animal.
3. In linguistics, the patterns of word formation in a particular language, including inflection, derivation, and composition; the study and description of such patterns.
4. The study of the behavior and combination of morphemes.
5. Physical geography, geomorphology.
6. The form or structure of anything: "She wanted to gain an insight into the morphology of our political system."
7. The study of the form or structure of anything; such as, the anatomy of an animal.

The study of a river channel and the network of tributaries within the river basin, in which an aerial view and the shape of a given cross section within a limited reach are examined at several points along the channel

The study of a channel pattern and its geometric forms at several points along a waterway, including the network of tributaries within a drainage basin.