Definition
Serifs are either abrupt — meaning they break from the stem suddenly at an angle — or they are adnate, meaning that they flow smoothly into or out of the stem. In the older typographic literature, adnate serifs are generally described as bracketed.
Source
— Robert Bringhurst — p. 321:
Serifs are either abrupt — meaning they break from the stem suddenly at an angle — or they are adnate, meaning that they flow smoothly into or out of the stem.
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