Past tense of 'ess'; formed into or shaped like the letter S or an S-curve.
From ess (the letter S or S-shape) + -ed (English past tense marker). Ess comes from the pronunciation of the letter S in Latin.
Words can be verbed from almost anything—even letters! Medieval scribes talked about 'essing' their letters, and that verb survives in modern road design and curve descriptions.
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