Arginūsae

ārum, f.
I. three small islands in the Ægean Sea, near Lesbos: classem ab Arginusis removere, Cic. Off. 1, 24, 84 B. and K.: Arginussae ab Aege IIII. M. passuum distant, Plin. 5, 31, 39, § 140 Jan.—And in sing.: circa Arginussam, Plin. 8, 58, 83, § 225.
Lewis & Short
A Latin Dictionary, 1879
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