Definitions

1. noun

a congenital condition in which a person is born without a particular organ or body part, although all the necessary tissues or buds may be present

“The baby was born with agenesis of the lower spine and required immediate medical attention.”

2. noun

a condition in which a part or organ of an organism fails to develop during embryonic development

“The researchers studied the different types of agenesis that could occur in plant development.”