marker
n. countable B2 Upper Intermediate Oxford US //ˈmɑɹkɝ// UK //mˈɑːkɐ// mark·er
n. a special pen with a thick tip used for writing or drawing. You can also use this word for an object that shows the position of something.
n. an instrument used for marking or drawing, typically featuring a felt or nylon tip and its own ink source. Also refers to a physical object or sign used to indicate a position, boundary, or progress.
Use a red marker to highlight the important dates.
The hikers placed a pile of stones as a marker to help them find the trail on their way back.
The sudden increase in specific protein levels served as a biological marker for the early onset of the disease, allowing doctors to intervene before symptoms appeared.
From mark + -er.
Usage
Commonly used in compound nouns like 'whiteboard marker' or 'permanent marker'.