1. The term seems to have been specially applied to a captain’s mistress, though it is also found as a general name for a courtesan.
John Marston. The Malcontent (1603), glossary of terms
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2. a mythical beast, essentially a two-legged dragon or serpent-like creature with a rooster's head. Described by Laurence Breiner as "an ornament in the drama and poetry of the Elizabethans", it was featured prominently in English thought and myth for centuries.
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A sort of serpent hatched form the egg of a cock. The basilisk had a bad eye, and its glance was fatal. Many infidels deny this creature's existence, but Semprello Aurator saw and handled one that had been blinded by lightning as a punishment for having fatally gazed on a lady of rank whom Jupiter loved. Juno afterward restored the reptile's sight and hid it in a cave. Nothing is so well attested by the ancients as the existence of the basilisk, but the cocks have stopped laying.
Ambose Bierce. The Devil's Dictionary (1911)
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according to ancient writers t[it] is produced from an egg laid by a nine-year-old cock and hatched by a toad on a dunghill. Probably this is merely the expression of the intensified loathing which it was desired to typify. But the heraldic basilisk is stated to have its tail terminating in a dragon's head.
Arthur Charles Fox-Davies. A Complete Guide to Heraldry (1909)
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Ambrose Parey. The Workes of that famous Chirurgion Ambrose Parey (published: Latin in 1579, English in 1649), p.517