Etymology
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ascender (n.)

1620s, agent noun from ascend (v.). In typography from 1867.

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Definitions of ascender

ascender (n.)
someone who ascends;
ascender (n.)
a lowercase letter that has a part extending above other lowercase letters;
ascender (n.)
(printing) the part of tall lowercase letters that extends above the other lowercase letters;
From wordnet.princeton.edu