semirigid

[sem-ee-rij-id, sem-ahy-]
adjective
1.
not fully rigid; partly rigid.
2.
Aeronautics. noting or pertaining to a type of airship whose shape is maintained by means of a rigid keellike structure and by internal gas pressure.

Origin:
1905–10; semi- + rigid

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World English Dictionary
semirigid (ˌsɛmɪˈrɪdʒɪd)
 
adj
1.  partly but not wholly rigid
2.  (of an airship) maintaining shape by means of a main supporting keel and internal gas pressure

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Example sentences
These semirigid airships were often used for reconnaissance flights.
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