microdot
/ˈmaɪkroʊˌdɑt/
noun
- A very small photograph or piece of text, often used for secret communication or espionage.
- The spy hid a microdot inside a book binding.
- He used a microscope to read the microdot on the letter.
- Microdots were a common tool for covert messages during the Cold War.
- A tiny pill or tablet, especially one containing a psychedelic drug like LSD.
- In the 1960s, microdots were a popular form of LSD.
- The microdot was so small it could be placed under the tongue.
- He found a microdot in the bottom of the bag.