egg cell https://www.swissbiopics.org/api/image/Egg_cell.svg BTO:0000369 A female gamete where meiosis has progressed to metaphase II and is able to participate in fertilization. ZFA:0001570 BTO:0003801 MESH:D010063 FBbt:00057012 PO:0020094 SNOMEDCT:73153001 mature oocyte ovum MAT:0000213 CALOHA:TS-2191 FMA:67343 germ cell gametophyte