diff --git a/glossary.tex b/glossary.tex
index 74ea3e5f50e550ce077a6455cd4d80bbae60ad6d..8688c5fd40337261fd0feeea1f33494325c1e377 100644
--- a/glossary.tex
+++ b/glossary.tex
@@ -740,7 +740,7 @@ Set the darker die to `\dicef{6}' and roll the other.  If this roll fails, it fa
 }
 
 \longnewglossaryentry{sphere}{
-  name={Sphere},
+  name={Spheres},
   prefix={a\space},
   parent={alchemy},
   description={divide the world into meaningful parts.