IPA: /ˌhaɪpəˈpleɪziə/
KK: /haɪˈpɒpleɪziə/
A medical condition where an organ or part of the body does not develop fully, resulting in it being smaller than normal or not fully formed.
The doctor diagnosed her with hypoplasia of the enamel, which caused her teeth to be weaker than usual.
Hypoplasia → It is formed from "hypo-" (meaning under or below) and "plasis" (from Greek "plassein", meaning to form or mold). The word describes a condition where there is an underdevelopment or incomplete formation of a tissue or organ.
Think of 'under' ('hypo-') and 'formation' ('plasis') to remember that hypoplasia refers to a condition of underdevelopment.