engrail

from The Century Dictionary.

• To variegate; spot, as with hail.
• To make serrate; give an indented outline to.
• To form an edging or border; run in a waving or indented line.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To variegate or spot, as with hail.
• transitive verb (Her.) To indent with small curves. See Engrailed.
• intransitive verb To form an edging or border; to run in curved or indented lines.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb To form an edging or border; to run in curved or indented lines.