biserrate

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

• adjective Botany Having serrations that are themselves serrated; doubly serrate.
• adjective Zoology Serrated on both sides.

from The Century Dictionary.

• In botany, doubly serrate: said of leaves the serratures of which are themselves serrate.
• In entomology, having two small triangular teeth placed close together, like the teeth of a saw.

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

• adjective (Bot.) Doubly serrate, or having the serratures serrate, as in some leaves.
• adjective (Zoöl.) Serrate on both sides, as some antennæ.

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

• adjective botany, of leaves Having serration that are themselves serrate.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective having saw-like notches with the notches themselves similarly notched