serration
Noun
Meaning
Condition of being serrate; formation in the shape of a saw.
One of the teeth in a serrate or serrulate margin.
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one of the serrations was broken off
the pliers had serrations to improve the grip
the serrations of a city skyline
However, the serration vein originates from lower down the central vein of the leaflet, typically opposite to the position of, not the first notch down, but the next notch.
As is common in serrated leaves, each serration has a central vein extending to its tip.
This means that on its way from the midrib of the leaflet to the point of the serration, the vein serving the tip of the serration passes close by the intervening notch.