Final answer:
A deep-water wave is a wave in which the wavelength is greater than half the water depth.
Step-by-step explanation:
A deep-water wave is defined as a wave in which the wavelength is greater than half the water depth. These waves occur in areas where the water depth is generally greater than half the wavelength.
Deep-water waves include tsunami waves. Swell waves, wind waves, and rogue waves are examples of waves that can never be in deep water because their wavelengths are less than the water depth.