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obstruction [əb'strʌkʃ(ə)n] n
med.	απόφραξη; φράξιμο; κλείσιμο; στένωση
obstruction [əb'strʌkʃ(ə)n] n
transp.	εμπόδιο; κυκλοφοριακή συμφόρηση
English thesaurus
obstruction [əb'strʌkʃ(ə)n] abbr.
abbr., mil.	obst; obstn
avia., Canada	All fixed whether temporary or permanent and mobile objects, or parts thereof, that are located on an area intended for the surface movement of aircraft or that extend above a defined surface intended to protect aircraft in flight
mil., abbr.	ob
mil., logist.	Movement hindrance built without destroying or damaging the route itself. (FRA)

obstruction : 46 phrases in 7 subjects

Astronautics	1
Communications	4
Environment	1
General	1
Health care	2
Medical	26
Transport	11