I found this information on another site:
You should be able to find it here:
/wp-content/plugins/woocommerce/classes/class-wc-product.php on or around line 704
/** Functions for getting parts of a price, in html, used by get_price_html */
function get_price_html_from_text() {
return ‘<span class=”from”>’ . _x(‘From:’, ‘min_price’, ‘woocommerce’) . ‘ </span>’;
You should just be able to remove the word or replace it with what you want.