An acid-base indicator which is colorless in acid solution, but turns pink to red as the solution becomes alkaline. It is used medicinally as a cathartic.
Oillet
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A small opening or loophole, sometimes circular, used in
mediaeval fortifications.
Oillet meaning & definition 1 of Oillet.
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In the times of [castle] warfare, these were windows that went through thick walls of the front of [the castle] where the window was wider on the inside than on the outside. A benefit to such windows is it was easy to fire an [arrow] out, but archers on the outside would have trouble firing back at you.
A word that rhymes with toilet.Oillet meaning & definition 2 of Oillet.
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An aperture or loophole for observation, especially in a wall; = eyelet. Now (Architecture): a round opening at the end of an arrow-slit (historical).
Oillet meaning & definition 3 of Oillet.
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