Consistently avoid "derived function" for trains: use "compound function" instead

1 files changed, 1 insertions, 0 deletions

diff --git a/doc/glossary.md b/doc/glossary.md
index 49ce50e7..50f5998f 100644
--- a/doc/glossary.md
+++ b/doc/glossary.md
@@ -83,6 +83,7 @@ The possible roles are:
 * **Monadic**: Called with one argument, either always (a monadic function) or in a particular instance (a monadic call).
 * **Dyadic**: Called with two arguments, always or in a particular instance.
 
+* **Compound function**: A derived function or train.
 * **Derived function**: A function produced by binding operands to a deferred modifier; doing so does not cause any computation.
 * [**Train**](train.md): A function composed of two or more functions.
 * [**Identity value**](fold.md#identity-values): An inferred property of a function: the result of a reduction with this function on an empty array.