Unify "file-descriptor" to "file descriptor".
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 24830d2..bc4cf42 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -651,7 +651,7 @@
.. function:: ttyname(fd)
Return a string which specifies the terminal device associated with
- file-descriptor *fd*. If *fd* is not associated with a terminal device, an
+ file descriptor *fd*. If *fd* is not associated with a terminal device, an
exception is raised. Availability:Macintosh, Unix.
diff --git a/Doc/library/pty.rst b/Doc/library/pty.rst
index 5e1da22..ec1c75f 100644
--- a/Doc/library/pty.rst
+++ b/Doc/library/pty.rst
@@ -43,6 +43,6 @@
reading from the controlling terminal.
The functions *master_read* and *stdin_read* should be functions which read from
- a file-descriptor. The defaults try to read 1024 bytes each time they are
+ a file descriptor. The defaults try to read 1024 bytes each time they are
called.