hard sphere
chiefly Physics
noun
(As a concept in theoretical models) an idealized sphere that is perfectly hard, inelastic, and impenetrable.
Origin
Early 19th century.
- undifferenced
- undifferentiated
- undigested
- undignified
- undiluted
- undiminished
- undimmed
- undinal
- undine
- undiplomatic
- undiplomatically
- undirected
- undiscerning
- undischarged
- undisciplined
- undisclosed
- undiscoverable
- undiscovered
- undiscriminating
- undiscussed
- undisguised
- undisguisedly
- undismayed
- undisputable
- undisputed