hash-table-delete!

[procedure] hash-table-delete! hash-table key

SRFI-69: This procedure removes any association to key in hash-table. It is not an error if no association for that key exists; in this case, nothing is done.

[procedure] hash-table-delete! hash-table key

Gauche: See Concept:HashTable.

This is called hash-table-remove! or hashtable-remove! in other implementations.