1. [n]  (printing) the part of tall lowercase letters that extends above the other lowercase letters
2. [n]  a lowercase letter that has a part extending above other lowercase letters
3. [n]  someone who ascends

A lowercase letter that extends above the "x-height" (the height of the letter "x"), such as "d", "t", or "h". Also used to denote the part of the letter extending above the x-height.

Compare descender.