(Προμαχόρμα), i. e. "the protectress of the bay," was a surname of Athena, under which she had a sanctuary on mount Buporthmos near Hermione. (Paus. 2.34.9.)
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890