“that which I have seene most fruitful is sower [sour] oranges and lemons . . . I wish that some learned man would write of it [scurvy], for it is the plague of the sea, and the spoyle of mariners.”
— Sir Richard Hawkins, 1590
A gimlet is a small hand drill, meant (back when things were still sealed in barrels) to drill a hole in a barrel and let whatever was put inside out. A gimlet pierces things, and so people with a sharp gaze were “gimlet-eyed”. A Gimlet also pierces.