Definition of tessellating:
(v) :
(intransitive, geometry) to cover a two-dimensional shape, such that multiple copies of itself placed edge to edge cover an area leaving no space between the shapes.
(v) :
(transitive, geometry) To completely fill (an area) when multiple copies of one or more two-dimensional shapes are placed edge to edge.
(v) :
(transitive) To cover with tiles or stones, as a mosaic; to tile.
(adj) :
tessellated