Rooting Reflex
Although this isn't the definition of the rooting reflex, weeding is the first thing I think of when the rooting reflex is mentioned. So although these two things are completely unrelated, in my mind, they are linked for some reason and it helps me with the definition because when i hear or think of weeding, i think of looking for something, like a baby's rooting reflex is looking for a food source.
Rooting reflex: a baby's tendency, when touched on the cheek, to open the mouth and search for the nipple.