Third-person singular present tense: roughens or makes rough.
From Latin 'asperare' with the English third-person singular present suffix '-s'. This is a standard conjugation pattern inherited through centuries of Latin influence on English verb formation.
Even though this word is archaic, the concept behind it—that surfaces can be deliberately treated to change their properties—remains fundamental to modern materials science and nanotechnology, where scientists engineer roughness at microscopic scales.
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