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The word "undersides" is correct and can be used in written English
You can use it when referring to the underside of an object, such as its underside or bottom side. For example, "We found a fish nest beneath the dock, its undersides pressed against the wood."
Dictionary
undersides
noun
Plural of underside
synonyms
Exact(60)
And in place of rules, use floating "rule molecules" whose undersides encode the state and symbol that trigger a rule, and whose topsides encode the new state and new symbol resulting from it.
He could detect shallower water by colour, and see the light of invisible lagoons reflected in the undersides of clouds.
"I thought ours indeed was a land of shame, a land of murder and a land of strange, throttled, sacrificial women," its narrator concludes.In two recent novels, "House of Splendid Isolation" and "Wild Decembers", Ms O'Brien fastened on real events to explore in fiction the undersides of Ireland.
Some species of Sorex are tricoloured, having a dark brown back, grayish brown sides, and grayish undersides.
Most modern branchiopods anchor by the pedicle to pebbles, to the undersides of stones, or to other hard objects.
The chin and chest are sky blue, and the green wings are ornamented with red, blue, and green on the undersides.
The backs of the flippers are coloured black, whereas the undersides are coloured white with black tips.
The edible hen of the woods (P. frondosus), which grows on old trees and stumps, produces a cluster of grayish mushrooms with two or three caps on a stalk; the undersides of the caps are porous.
Bristlemouth, also called lightfish, (family Gonostomatidae), any of the approximately 33 species of oceanic fishes (order Stomiiformes), occurring in tropical regions of the major oceans and characterized by luminescent organs on the undersides of their bodies.
Arboreal geckos and anoles (Anolis) have lamellae (fine plates) on the undersides of the toes.
They are pale green above and have a brownish, crusty coat of matted hairs below; the undersides become bluish white as the hairs are shed during the summer.
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CEO of Professional Science Editing for Scientists @ prosciediting.com