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terminator

mastery

UK /ˈtɜː.mɪ.neɪ.tə/ US /ˈtɝ.mɪˌneɪ.tɚ/noun

card 1 of 5 · context meaning

What does 'terminator' refer to in this sentence?

Harriot, looking at the moon, saw the irregular terminator, the highlights and shadows, the mountain ranges and valleys that Galileo had described.