An extensive undulation of the surface of a sandy beach or sea bed, that is typically tens of metres from crest to crest and tens of centimetres in height, but may be much larger.
Origin
1950s.
Definition of megaripple in US English:
megaripple
nounˈmɛɡəˌrɪpl
Geology
An extensive undulation of the surface of a sandy beach or sea bed, that is typically tens of metres from crest to crest and tens of centimetres in height, but may be much larger.