Having a shape like an arrowhead; pointed and triangular, tapering to a sharp tip.
Compound adjective from arrowhead (noun) + -ed (adjective marker). Arrowhead itself comes from the physical shape of arrow tips; the -ed suffix makes it an adjective describing something with that characteristic shape.
Arrowheaded leaves on some plants evolved because that pointed shape helps water run off—nature designed the arrowhead shape millions of years before humans made arrows.
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