WordPress at a glance
action is not described

(taxonomy)_pre_add_form action-hook . WP 3.0.0

Fires before the Add Term form for all taxonomies.

The dynamic portion of the hook name, $taxonomy, refers to the taxonomy slug.

Usage

add_action( '(taxonomy)_pre_add_form', 'action_function_name_3338' );
function action_function_name_3338( $taxonomy ){
	// action...
}
$taxonomy(string)
The taxonomy slug.

Where the hook is called

In file: /wp-admin/edit-tags.php
(taxonomy)_pre_add_form
wp-admin/edit-tags.php 369
do_action( "{$taxonomy}_pre_add_form", $taxonomy );

Where the hook is used (in WP core)

Does not used.