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abutment
abuttals
abuzz
abvolt
abwatt
abysmal
abyss
abyssal
abyssal plain
Abyssinia
Abyssinian cat
abyssopelagic
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abyssal plain
a·bys·sal plain (plural a·bys·sal plains)


noun 
Definition:
 
deep seafloor: a broad flat area of seafloor at the deepest part of an ocean basin
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