Sharp-pointed woody structures, usually modified from a leaf or part of a leaf.
sharp projections developed from modified leaves
Horn-like projections formed upon a lava dome.
the pointed edges of a stain that radiate out to form the spatter
Closed or solid structure projecting outward from the cell's surface.
a sharp-pointed woody structure, usually a modified leaf or leaf part.
1) Unpaired, unsegmented, unbranched fin supports, usually (but not always) stiff and pungent; may initially form as bilaterally paired structures prior to ossification. 2) Bony, pointed, elongate projections on the body, usually the head, that are often temporary specialisations for pelagic life.