1. Plural of ootid; the mature egg cell produced during oogenesis after the second meiotic division.
Usage: biology; technical term used in reproductive biology and embryology

Examples

• During oogenesis, the secondary oocyte divides to form an ootid and the second polar body.
• Ootids are the functional female gametes in most animals.
• The ootid contains most of the cytoplasm from the original oocyte.
• After fertilization, the ootid becomes a zygote.
• Biologists studied the development of ootids under the microscope.