As nouns the difference between postscript and appendage
is that postscript is (countable) an addendum to a letter, added after the author’s signature while appendage is an external body part that projects from the body.
As a verb postscript
is to extend (a letter or another document) with additional remarks.
postscript
English
Alternative forms
* post script
* postscriptum (post scriptum)
* PS (, etc.)
Noun
(
en noun)
(countable) An addendum to a letter, added after the author’s signature.
(countable) An addition to a story, play, etc.
Usage notes
To indicate the beginning of a postscript to a letter, one often uses the abbreviation PS'' (or '' , etc) followed by a colon or comma.
Verb
(
en verb)
To extend (a letter or another document) with additional remarks.
appendage
English
Noun
(
en noun)
an external body part that projects from the body
a natural prolongation or projection from a part of any organism
a part that is joined to something larger
Synonyms
* extremity, member
* outgrowth, process