notched like a saw, with the teeth also notched; doubly serrate.
Origin of biserrate
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for biserrate
Historical Examples of biserrate
botany (of leaf margins, etc) having serrations that are themselves serrate
zoology serrated on both sides, as the antennae of some insects
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012