lacinia

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A slash in or a slender lobe of a leaf or petal.
• noun The apex of the insect maxilla.

from The Century Dictionary.

• noun In botany, a long slash or incision in a leaf, petal, or similar organ; also, one of the narrow lobes or segments resulting from such incisions.
• noun In entomology, the apex of the maxilla, especially when it is slender and bladelike, as in many Coleoptera. See galea, 1 .
• noun A genus of mollusks: same as Chama. Humphreys.
• noun A genus of protozoans.

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

• noun One of the narrow, jagged, irregular pieces or divisions which form a sort of fringe on the borders of the petals of some flowers.
• noun A narrow, slender portion of the edge of a monophyllous calyx, or of any irregularly incised leaf.
• noun (Zoöl.) The posterior, inner process of the stipes on the maxillæ of insects.

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

• noun botany One of the narrow, jagged, irregular pieces or divisions which form a sort of fringe on the borders of the petals of some flowers.
• noun botany A narrow, slender portion of the edge of a monophyllous calyx, or of any irregularly incised leaf.
• noun zoology The posterior inner process of the stipes on the maxillae of insects.