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.

Origin:
1530–40; < Latin rigidus, equivalent to rig(ēre) to be stiff, stiffen + -idus -id4

ri·gid·i·ty, rig·id·ness, noun
rig·id·ly, adverb
o·ver·rig·id, adjective
o·ver·rig·id·ly, adverb
o·ver·rig·id·ness, noun
o·ver·ri·gid·i·ty, noun
sub·rig·id, adjective
sub·rig·id·ly, adverb
sub·rig·id·ness, noun
sub·ri·gid·i·ty, noun
un·rig·id, adjective
un·rig·id·ly, adverb
un·rig·id·ness, noun


1. unbending, firm, inflexible. 2. immovable, static. 3. austere, stern, unyielding. See strict. 4, 5. demanding.


1. elastic. 3. lax.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To rigid
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Rigid is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
rigid (ˈrɪdʒɪd) [Click for IPA pronunciation guide]
 
adj
1.  not bending; physically inflexible or stiff: a rigid piece of plastic
2.  unbending; rigorously strict; severe: rigid rules
 
adv
3.  completely or excessively: the lecture bored him rigid
 
[C16: from Latin rigidus, from rigēre to be stiff]
 
'rigidly
 
adv
 
ri'gidity
 
n
 
'rigidness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

rigid
1538, from L. rigidus "hard, stiff, rough, severe," from rigere "be stiff," from PIE *reig- "stretch (tight), bind tightly, make fast" (cf. O.Ir. riag "torture," M.H.G. ric "band, string"), related to L. frigus "cold," Gk. rhigos "frost, cold."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The festival is a three-day-long celebration that combines sumptuous feasts as
  well as rigid fasting.
The flexible three-toed sloth has nine vertebrae and the more rigid two-toed
  sloth has only six.
Suddenly, the interface isn't fixed and rigid, it's fluid and molten.
She is still surprised by the rigid manners, the deference and silences in her
  husband's family.
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