noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A genetic disorder characterized by dense, fragile bones and dwarfism. countable, uncountable
2. 2
   a form of dwarfism accompanied by fragile bones and bad teeth wordnet

Etymology

From Ancient Greek πυκνός (puknós, “dense”) + dys- (“defective”) + ostosis (“condition of the bone”).

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.