diff --git a/data/lexicon/nouns/singulars.js b/data/lexicon/nouns/singulars.js
index 1030264f1..8877d3021 100644
--- a/data/lexicon/nouns/singulars.js
+++ b/data/lexicon/nouns/singulars.js
@@ -403,6 +403,7 @@ export default [
   'tributary',
   'flower',
   'sandwich',
+  'x ray',
 ]