Definition of Tucana
astronomy
: a southern constellation that is visible between the constellations of Hydrus and Grus and that is represented by the figure of a toucan
- Over a similar 10-day period last month, the Hubble telescope operated by the National Aeronautics and Space Administration was focused on a narrow region in the constellation Tucana, near the south celestial pole.
- —John Noble Wilford, New York Times, 24 Nov. 1998
