diff --git a/library/core/src/alloc/mod.rs b/library/core/src/alloc/mod.rs
index 06a761531b6..1f1033b0437 100644
--- a/library/core/src/alloc/mod.rs
+++ b/library/core/src/alloc/mod.rs
@@ -338,9 +338,9 @@ unsafe fn shrink(
         Ok(new_ptr)
     }
 
-    /// Creates a "by reference" adaptor for this instance of `Allocator`.
+    /// Creates a "by reference" adapter for this instance of `Allocator`.
     ///
-    /// The returned adaptor also implements `Allocator` and will simply borrow this.
+    /// The returned adapter also implements `Allocator` and will simply borrow this.
     #[inline(always)]
     fn by_ref(&self) -> &Self
     where
diff --git a/library/core/src/iter/traits/iterator.rs b/library/core/src/iter/traits/iterator.rs
index f34adb878c4..537e42f66de 100644
--- a/library/core/src/iter/traits/iterator.rs
+++ b/library/core/src/iter/traits/iterator.rs
@@ -694,7 +694,7 @@ fn map<B, F>(self, f: F) -> Map<Self, F>
     /// more idiomatic to use a `for` loop, but `for_each` may be more legible
     /// when processing items at the end of longer iterator chains. In some
     /// cases `for_each` may also be faster than a loop, because it will use
-    /// internal iteration on adaptors like `Chain`.
+    /// internal iteration on adapters like `Chain`.
     ///
     /// [`for`]: ../../book/ch03-05-control-flow.html#looping-through-a-collection-with-for
     ///
@@ -1293,7 +1293,7 @@ fn take(self, n: usize) -> Take<Self>
         Take::new(self, n)
     }
 
-    /// An iterator adaptor similar to [`fold`] that holds internal state and
+    /// An iterator adapter similar to [`fold`] that holds internal state and
     /// produces a new iterator.
     ///
     /// [`fold`]: Iterator::fold
@@ -1604,7 +1604,7 @@ fn inspect<F>(self, f: F) -> Inspect<Self, F>
 
     /// Borrows an iterator, rather than consuming it.
     ///
-    /// This is useful to allow applying iterator adaptors while still
+    /// This is useful to allow applying iterator adapters while still
     /// retaining ownership of the original iterator.
     ///
     /// # Examples
diff --git a/library/core/tests/iter/adapters/mod.rs b/library/core/tests/iter/adapters/mod.rs
index 96a53be1eaa..567d9fe49ca 100644
--- a/library/core/tests/iter/adapters/mod.rs
+++ b/library/core/tests/iter/adapters/mod.rs
@@ -24,7 +24,7 @@
 
 /// An iterator that panics whenever `next` or next_back` is called
 /// after `None` has already been returned. This does not violate
-/// `Iterator`'s contract. Used to test that iterator adaptors don't
+/// `Iterator`'s contract. Used to test that iterator adapters don't
 /// poll their inner iterators after exhausting them.
 pub struct NonFused<I> {
     iter: I,
diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index b336b65ad7d..fa073d080c6 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -810,9 +810,9 @@ fn read_exact(&mut self, buf: &mut [u8]) -> Result<()> {
         default_read_exact(self, buf)
     }
 
-    /// Creates a "by reference" adaptor for this instance of `Read`.
+    /// Creates a "by reference" adapter for this instance of `Read`.
     ///
-    /// The returned adaptor also implements `Read` and will simply borrow this
+    /// The returned adapter also implements `Read` and will simply borrow this
     /// current reader.
     ///
     /// # Examples
@@ -889,7 +889,7 @@ fn bytes(self) -> Bytes<Self>
         Bytes { inner: self }
     }
 
-    /// Creates an adaptor which will chain this stream with another.
+    /// Creates an adapter which will chain this stream with another.
     ///
     /// The returned `Read` instance will first read all bytes from this object
     /// until EOF is encountered. Afterwards the output is equivalent to the
@@ -927,7 +927,7 @@ fn chain<R: Read>(self, next: R) -> Chain<Self, R>
         Chain { first: self, second: next, done_first: false }
     }
 
-    /// Creates an adaptor which will read at most `limit` bytes from it.
+    /// Creates an adapter which will read at most `limit` bytes from it.
     ///
     /// This function returns a new instance of `Read` which will read at most
     /// `limit` bytes, after which it will always return EOF ([`Ok(0)`]). Any
@@ -1326,7 +1326,7 @@ pub fn initialize(&self, buf: &mut [u8]) {
 /// * The [`write`] method will attempt to write some data into the object,
 ///   returning how many bytes were successfully written.
 ///
-/// * The [`flush`] method is useful for adaptors and explicit buffers
+/// * The [`flush`] method is useful for adapters and explicit buffers
 ///   themselves for ensuring that all buffered data has been pushed out to the
 ///   'true sink'.
 ///
@@ -1646,12 +1646,12 @@ fn write_all_vectored(&mut self, mut bufs: &mut [IoSlice<'_>]) -> Result<()> {
     fn write_fmt(&mut self, fmt: fmt::Arguments<'_>) -> Result<()> {
         // Create a shim which translates a Write to a fmt::Write and saves
         // off I/O errors. instead of discarding them
-        struct Adaptor<'a, T: ?Sized + 'a> {
+        struct Adapter<'a, T: ?Sized + 'a> {
             inner: &'a mut T,
             error: Result<()>,
         }
 
-        impl<T: Write + ?Sized> fmt::Write for Adaptor<'_, T> {
+        impl<T: Write + ?Sized> fmt::Write for Adapter<'_, T> {
             fn write_str(&mut self, s: &str) -> fmt::Result {
                 match self.inner.write_all(s.as_bytes()) {
                     Ok(()) => Ok(()),
@@ -1663,7 +1663,7 @@ fn write_str(&mut self, s: &str) -> fmt::Result {
             }
         }
 
-        let mut output = Adaptor { inner: self, error: Ok(()) };
+        let mut output = Adapter { inner: self, error: Ok(()) };
         match fmt::write(&mut output, fmt) {
             Ok(()) => Ok(()),
             Err(..) => {
@@ -1677,9 +1677,9 @@ fn write_str(&mut self, s: &str) -> fmt::Result {
         }
     }
 
-    /// Creates a "by reference" adaptor for this instance of `Write`.
+    /// Creates a "by reference" adapter for this instance of `Write`.
     ///
-    /// The returned adaptor also implements `Write` and will simply borrow this
+    /// The returned adapter also implements `Write` and will simply borrow this
     /// current writer.
     ///
     /// # Examples
@@ -2263,7 +2263,7 @@ fn lines(self) -> Lines<Self>
     }
 }
 
-/// Adaptor to chain together two readers.
+/// Adapter to chain together two readers.
 ///
 /// This struct is generally created by calling [`chain`] on a reader.
 /// Please see the documentation of [`chain`] for more details.
@@ -2414,7 +2414,7 @@ fn upper_bound(&self) -> Option<usize> {
     }
 }
 
-/// Reader adaptor which limits the bytes read from an underlying reader.
+/// Reader adapter which limits the bytes read from an underlying reader.
 ///
 /// This struct is generally created by calling [`take`] on a reader.
 /// Please see the documentation of [`take`] for more details.