(4 syl.). A white wand carried by Roman officers when they went
to treat for peace. The Egyptians adorned the rod with a male and
female serpent twisted about it, and kissing each other. From this use
of the rod, it became the symbol of eloquence and also of office. In
mythology, a caduceus with wings is placed in the hands of Mercury, the
herald of the gods; and the poets feign that he could therewith give
sleep to whomsoever he chose; wherefore Milton styles it “his opiate
rod” in Paradise Lost, xi. 133.
So with his dread caduceus Hermës led
From the dark regions of the imprisoned dead;
Or drove in silent shoals the lingering train
To Night's dull shore and Pluto's dreary reign.
Darwin: Loves of
the Plants, ii. 291.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894