The Collaborative International Dictionary
Biserrate
Biserrate \Bi*ser"rate\, a. [Pref. bi- + serrate.]
(Bot.) Doubly serrate, or having the serratures serrate, as in some leaves.
(Zo["o]l.) Serrate on both sides, as some antenn[ae].
Wiktionary
biserrate
a. (context botany of leaves English) Having serration that are themselves serrate.
WordNet
biserrate
adj. having sawlike notches with the notches themselves similarly notched