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Word of the Day - Rigid

rig·id
[rij-id]

adjective
1. stiff or unyielding; not pliant or flexible; hard: a rigid strip of metal.

2. firmly fixed or set.

3. inflexible, strict, or severe: a rigid disciplinarian; rigid rules of social behavior.

4. exacting; thorough; rigorous: a rigid examination.

5. so as to meet precise standards; stringent: lenses ground to rigid specifications.

6. Mechanics . of, pertaining to, or noting a body in which  the distance between any pair of points remains fixed under all forces; having infinite values for its shear modulus, bulk modulus, and Young’s modulus.

7. Aeronautics .
     a.
(of an airship or dirigible) having a form maintained by a stiff, unyielding structure contained within the envelope.
     b.
pertaining to a helicopter rotor that is held fixedly at its root.