Amyoplasia

Part of speech: noun

Definitions

1. A medical condition that involves the inadequate development of muscle tissue, resulting in varying levels of weakness in the affected individual
2. A disorder characterized by the insufficient formation of muscles, which causes significant limitations in physical functioning and mobility
3. A condition marked by the underdevelopment of muscle tissue that leads to major impairments in movement and physical capabilities

Etymology: Amyoplasia is a technical coinage built from three Greek pieces, and its parts are more interesting than the whole. The prefix "a-" is the Greek negation meaning "not" or "without," the same element found in words like "atheist" and "anarchy." The middle piece, "myo-," comes from Greek "mûs," meaning "muscle" (literally "mouse," since flexing muscles were thought to resemble mice moving under the skin). The final element, "-plasia," comes from Greek "plássō," meaning "to mould or form," which gave the noun "plásis," a forming or development. The suffix "-plasia" is used in medicine for growth or development of tissue, as in "hyperplasia" (excessive growth). Because the term is a modern scientific creation assembled from classical roots, it was not used by ancient Greek physicians; its literal sense is "without muscle formation."