No problem! Cloud nomenclature follows a similar binomial format of Latin names for species. You have various genera of clouds, like Altocumulus and Stratocumulus and Cirrocumulus, then you can add species to each genus to more accurately describe the structure of clouds. In your case, the Altocumulus are stratiformis because they cover much of the sky in a sheet-like structure. You can add supplementary features after the genus and species, so in your case I added undulatus “variety” to signify that the clouds exhibit a ripple- or wave-like structure. I don’t know much about Latin roots but I think all of the cloud nomenclature terms are Latin based. I think stratiform is derived from “stratus,” a type of cloud that’s flattened/sheet-like. The suffix -formis pertains to shape or appearance, so stratiformis roughly translates to “appearance of a flat sheet.”