n. the congenital absence of more than six teeth in the primary or permanent dentition or both. It is usually part of a syndrome and seldom occurs as an isolated entity.
n. the absence of all primary and/or permanent teeth because they have failed to develop. It is more common for only a few teeth to fail to develop (see hypodontia; oligodontia).... anodontia
n. congenital absence of one or more teeth (not including the third molars, whose absence is considered a normal variation). Forms of hypodontia include *oligodontia and *anodontia.... hypodontia
Health Encyclopedia