Index: src/wp-includes/post-template.php
===================================================================
--- src/wp-includes/post-template.php	(revision 43581)
+++ src/wp-includes/post-template.php	(working copy)
@@ -526,8 +526,23 @@
 	// hentry for hAtom compliance
 	$classes[] = 'hentry';

-	// All public taxonomies
+	// All public taxonomies.
 	$taxonomies = get_taxonomies( array( 'public' => true ) );
+
+	/**
+	 * Filters the taxonomies to generate classes for each individual term.
+	 *
+	 * Default is all public taxonomies registered to the post type.
+	 *
+	 * @since 4.9.9
+	 *
+	 * @param array   $taxonomies List of all public taxonomies to generate classes for.
+	 * @param array   $classes    An array of post class names.
+	 * @param array   $class      An array of additional class names added to the post.
+	 * @param int     $post_id    The post ID.
+	 */
+	$taxonomies = apply_filters( 'post_class_taxonomies', $taxonomies, $classes, $class, $post->ID );
+
 	foreach ( (array) $taxonomies as $taxonomy ) {
 		if ( is_object_in_taxonomy( $post->post_type, $taxonomy ) ) {
 			foreach ( (array) get_the_terms( $post->ID, $taxonomy ) as $term ) {