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"lowest" is also used as a crossword clue. If that's what you saw, the answer is often basal (5 letters).
Definitions
lowest in rank or importance
Used in a sentence
“Yang says he remembers being able to see the glacier’s lowest edge from his home village. But that time has passed.”
“At the lowest point, a short length of tunnel was driven alongside the up line, with a cross passage, to serve as a sump and pump house for dealing with any accumulation of water.”
“Whoever bends lowest will win the limbo tournament.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“At the bottom”6 letters
02“Least high”6 letters
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