dirigible

from WordNet (r) 3.0 (2006)

dirigible
    adj 1: capable of being steered or directed [syn: {steerable},
           {dirigible}]
    n 1: a steerable self-propelled aircraft [syn: {airship},
         {dirigible}]

from The Collaborative International Dictionary of English v.0.48

Dirigible \Dir"i*gi*ble\, a.
   Capable of being directed; steerable; as, a dirigible
   balloon.
   [1913 Webster]

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