apostrophe

noun3

1. •
   The text character ’, which serves as a punctuation mark in various languages and as a diacritical mark in certain rare contexts.

   • Since its inception the apostrophe has been a controversial piece of punctuation. — 2021
2. •
   (rhetoric) A sudden exclamatory piece of dialogue addressed to someone or something, especially absent.

   • Apostrophe a bold digression makes, Mov'd by some sudden thought the theme awakes. — 1835
3. •
   An arrangement of chlorophyll grains perpendicular to the outer surface of plant cells, as opposed to epistrophe (an arrangement on the outer surface).

   • As is well known, chloroplast in the epistrophe position presents an oval or more or less circular form; in the apostrophe position a flattened and lenticular form. — 1905