Irregularly: bot

• Jagged, as a leaf edge
• Shaped like an oak leaf
• With a gnawed edge
• Uneven, as if gnawed away
• Unevenly shaped
• Having irregular edges
• Uneven, as gnaw marks

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
of a leaf, an insect wing, etc., "with indented edges that appear as if gnawed," 1793, from Latin erosus , past participle of erodere "gnaw away" (see erode ).

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Erose \E*rose"\, a. [L. erosus, p. p. See Erode .] Irregular or uneven as if eaten or worn away. (Bot.) Jagged or irregularly toothed, as if nibbled out or gnawed. -- E*rose"ly , adv.

Wiktionary Word definitions in Wiktionary
a. Irregularly notched, eaten away, as though bitten