diff --git a/man2/stat.2 b/man2/stat.2
index c32d646e2..59844fc72 100644
--- a/man2/stat.2
+++ b/man2/stat.2
@@ -365,7 +365,11 @@ file timestamp fields.
 Glibc exposes the nanosecond component of each field using names either
 of the form
 .IR st_atim.tv_nsec ,
-if the _BSD_SOURCE or _SVID_SOURCE feature test macro is defined,
+if the
+.B _BSD_SOURCE
+or
+.B _SVID_SOURCE
+feature test macro is defined,
 or of the form
 .IR st_atimensec ,
 if neither of these macros is defined.
diff --git a/man3/ctime.3 b/man3/ctime.3
index 35840df7f..aeb60c871 100644
--- a/man3/ctime.3
+++ b/man3/ctime.3
@@ -266,7 +266,9 @@ const char *tm_zone;      /* Timezone abbreviation */
 .fi
 .RE
 .sp
-defined when _BSD_SOURCE was set before including
+defined when
+.B _BSD_SOURCE
+was set before including
 .IR <time.h> .
 This is a BSD extension, present in 4.3BSD-Reno.
 .SH "SEE ALSO"
diff --git a/man3/finite.3 b/man3/finite.3
index 9c8a22745..ef3585ed5 100644
--- a/man3/finite.3
+++ b/man3/finite.3
@@ -75,7 +75,13 @@ See
 
 On a glibc system, these functions are declared by
 .I <math.h>
-when _BSD_SOURCE or _SVID_SOURCE or _GNU_SOURCE is defined.
+when
+.B _BSD_SOURCE
+or
+.B _SVID_SOURCE
+or
+.B _GNU_SOURCE
+is defined.
 The isnan() functions will also be declared when _XOPEN_SOURCE
 is defined.
 .\" .SH HISTORY
diff --git a/man3/posix_memalign.3 b/man3/posix_memalign.3
index 10c407f9e..146e44f50 100644
--- a/man3/posix_memalign.3
+++ b/man3/posix_memalign.3
@@ -130,8 +130,14 @@ According to SUSv2,
 .BR valloc ()
 is declared in \fI<stdlib.h>\fP.
 Libc4,5 and glibc declare it in \fI<malloc.h>\fP and perhaps also in <stdlib.h>
-(namely, if _GNU_SOURCE is defined, or _BSD_SOURCE is defined, or,
-for glibc, if _XOPEN_SOURCE_EXTENDED is defined, or, equivalently,
+(namely, if
+.B _GNU_SOURCE
+is defined, or
+.B _BSD_SOURCE
+is defined, or,
+for glibc, if
+.B _XOPEN_SOURCE_EXTENDED
+is defined, or, equivalently,
 _XOPEN_SOURCE is defined to a value not less than 500).
 .SH NOTES
 On many systems there are alignment restrictions, for example, on buffers
diff --git a/man3/sigpause.3 b/man3/sigpause.3
index 57ef5485f..b416fbb20 100644
--- a/man3/sigpause.3
+++ b/man3/sigpause.3
@@ -78,7 +78,9 @@ architecture.
 
 Libc4 and libc5 only know about the BSD version.
 
-Glibc uses the BSD version if the _BSD_SOURCE feature test macro is
+Glibc uses the BSD version if the
+.B _BSD_SOURCE
+feature test macro is
 defined and none of _POSIX_SOURCE, _POSIX_C_SOURCE, _XOPEN_SOURCE,
 _GNU_SOURCE, or
 .B _SVID_SOURCE
diff --git a/man3/termios.3 b/man3/termios.3
index d45f765db..aafdfb053 100644
--- a/man3/termios.3
+++ b/man3/termios.3
@@ -200,25 +200,41 @@ If unset, fill character is ASCII NUL ('\\0').
 .B NLDLY
 Newline delay mask.
 Values are \fBNL0\fP and \fBNL1\fP.
-[requires _BSD_SOURCE or _SVID_SOURCE or _XOPEN_SOURCE]
+[requires
+.B _BSD_SOURCE
+or
+.B _SVID_SOURCE
+or _XOPEN_SOURCE]
 .TP
 .B CRDLY
 Carriage return delay mask.
 Values are \fBCR0\fP, \fBCR1\fP, \fBCR2\fP, or \fBCR3\fP.
-[requires _BSD_SOURCE or _SVID_SOURCE or _XOPEN_SOURCE]
+[requires
+.B _BSD_SOURCE
+or
+.B _SVID_SOURCE
+or _XOPEN_SOURCE]
 .TP
 .B TABDLY
 Horizontal tab delay mask.
 Values are \fBTAB0\fP, \fBTAB1\fP, \fBTAB2\fP, \fBTAB3\fP (or \fBXTABS\fP).
 A value of TAB3, that is, XTABS, expands tabs to spaces
 (with tab stops every eight columns).
-[requires _BSD_SOURCE or _SVID_SOURCE or _XOPEN_SOURCE]
+[requires
+.B _BSD_SOURCE
+or
+.B _SVID_SOURCE
+or _XOPEN_SOURCE]
 .TP
 .B BSDLY
 Backspace delay mask.
 Values are \fBBS0\fP or \fBBS1\fP.
 (Has never been implemented.)
-[requires _BSD_SOURCE or _SVID_SOURCE or _XOPEN_SOURCE]
+[requires
+.B _BSD_SOURCE
+or
+.B _SVID_SOURCE
+or _XOPEN_SOURCE]
 .TP
 .B VTDLY
 Vertical tab delay mask.
@@ -227,17 +243,25 @@ Values are \fBVT0\fP or \fBVT1\fP.
 .B FFDLY
 Form feed delay mask.
 Values are \fBFF0\fP or \fBFF1\fP.
-[requires _BSD_SOURCE or _SVID_SOURCE or _XOPEN_SOURCE]
+[requires
+.B _BSD_SOURCE
+or
+.B _SVID_SOURCE
+or _XOPEN_SOURCE]
 .PP
 \fIc_cflag\fP flag constants:
 .TP
 .B CBAUD
 (not in POSIX) Baud speed mask (4+1 bits).
-[requires _BSD_SOURCE or _SVID_SOURCE]
+[requires
+.B _BSD_SOURCE
+or _SVID_SOURCE]
 .TP
 .B CBAUDEX
 (not in POSIX) Extra baud speed mask (1 bit), included in CBAUD.
-[requires _BSD_SOURCE or _SVID_SOURCE]
+[requires
+.B _BSD_SOURCE
+or _SVID_SOURCE]
 .sp
 (POSIX says that the baud speed is stored in the
 .I termios
@@ -284,7 +308,9 @@ For use by \fBshl\fP (shell layers).  (Not implemented on Linux.)
 (not in POSIX) Mask for input speeds.
 The values for the CIBAUD bits are
 the same as the values for the CBAUD bits, shifted left IBSHIFT bits.
-[requires _BSD_SOURCE or _SVID_SOURCE]
+[requires
+.B _BSD_SOURCE
+or _SVID_SOURCE]
 (Not implemented on Linux.)
 .TP
 .B CMSPAR
@@ -295,11 +321,15 @@ devices): if
 is set, the parity bit is always 1; if
 .B PARODD
 is not set, then the parity bit is always 0).
-[requires _BSD_SOURCE or _SVID_SOURCE]
+[requires
+.B _BSD_SOURCE
+or _SVID_SOURCE]
 .TP
 .B CRTSCTS
 (not in POSIX) Enable RTS/CTS (hardware) flow control.
-[requires _BSD_SOURCE or _SVID_SOURCE]
+[requires
+.B _BSD_SOURCE
+or _SVID_SOURCE]
 .PP
 \fIc_lflag\fP flag constants:
 .TP
@@ -340,17 +370,23 @@ TAB, NL, START, and STOP are echoed as ^X, where X is the character with
 ASCII code 0x40 greater than the control signal.
 For example, character
 0x08 (BS) is echoed as ^H.
-[requires _BSD_SOURCE or _SVID_SOURCE]
+[requires
+.B _BSD_SOURCE
+or _SVID_SOURCE]
 .TP
 .B ECHOPRT
 (not in POSIX) If \fBICANON\fP and \fBIECHO\fP are also set, characters
 are printed as they are being erased.
-[requires _BSD_SOURCE or _SVID_SOURCE]
+[requires
+.B _BSD_SOURCE
+or _SVID_SOURCE]
 .TP
 .B ECHOKE
 (not in POSIX) If \fBICANON\fP is also set, KILL is echoed by erasing
 each character on the line, as specified by \fBECHOE\fP and \fBECHOPRT\fP.
-[requires _BSD_SOURCE or _SVID_SOURCE]
+[requires
+.B _BSD_SOURCE
+or _SVID_SOURCE]
 .TP
 .B DEFECHO
 (not in POSIX) Echo only when a process is reading.
@@ -361,7 +397,9 @@ each character on the line, as specified by \fBECHOE\fP and \fBECHOPRT\fP.
 Output is being flushed.
 This flag is toggled by typing
 the DISCARD character.
-[requires _BSD_SOURCE or _SVID_SOURCE]
+[requires
+.B _BSD_SOURCE
+or _SVID_SOURCE]
 .TP
 .B NOFLSH
 Disable flushing the input and output queues when generating the
@@ -383,7 +421,9 @@ which tries to write to its controlling terminal.
 All characters in the input queue are reprinted when
 the next character is read.
 (\fBbash\fP handles typeahead this way.)
-[requires _BSD_SOURCE or _SVID_SOURCE]
+[requires
+.B _BSD_SOURCE
+or _SVID_SOURCE]
 .TP
 .B IEXTEN
 Enable implementation-defined input processing.
diff --git a/man3/tmpnam.3 b/man3/tmpnam.3
index 340527ca3..3ddca97b7 100644
--- a/man3/tmpnam.3
+++ b/man3/tmpnam.3
@@ -121,7 +121,11 @@ tmpnam_r(char *s)
 apparently as a warning not to use NULL.
 A few systems implement it.
 To get a glibc prototype for this function,
-define _SVID_SOURCE or _BSD_SOURCE before including
+define
+.B _SVID_SOURCE
+or
+.B _BSD_SOURCE
+before including
 .IR "<stdio.h>" .
 .SH BUGS
 Never use this function.