Creates a named marker in the dictionary, such that executing the marker causes all words defined after it to be erased from the dictionary.

: tom ." tom" ;
marker dick
: harry ." harry" ;
dick

At this point, tom still exists in the dictionary, but harry (and any other definitions following harry) has been removed from the dictionary.

The dictionary pointers HERE and H are updated, as are the low and high memory pointers FFAILM and FFAIHM.

Cannot be used in a colon definition.