derelict derelict /ˈdɛrəˌlɪkt/

adjective

1. In deplorable condition  ( bedraggled , derelict , ramshackle , broken-down , dilapidated , tatterdemalion , tumble-down , dero [Informal, Australian, New Zeland] , derro [Informal, Australian, New Zeland] )
   in deplorable condition
    A street of bedraggled tenements
   a street of bedraggled tenements
    A broken-down fence
   a broken-down fence
    A ramshackle old pier
   a ramshackle old pier
    A tumble-down shack
   a tumble-down shack
   
2. Failing in what duty requires  ( delinquent , derelict , neglectful , remiss )
   failing in what duty requires
    Derelict (or delinquent) in his duty
   derelict (or delinquent) in his duty
    Neglectful of his duties
   neglectful of his duties
    Remiss of you not to pay your bills
   remiss of you not to pay your bills
   
3. Forsaken by owner or inhabitants  ( derelict , deserted , abandoned )
   forsaken by owner or inhabitants
    Weed-grown yard of an abandoned farmhouse
   weed-grown yard of an abandoned farmhouse
   
4. Worn and broken down by hard use  ( creaky , decrepit , derelict , flea-bitten , run-down , woebegone )
   worn and broken down by hard use
    A creaky shack
   a creaky shack
    A decrepit bus...its seats held together with friction tape
   a decrepit bus...its seats held together with friction tape
    A flea-bitten sofa
   a flea-bitten sofa
    A run-down neighborhood
   a run-down neighborhood
    A woebegone old shack
   a woebegone old shack
   

noun

1. A ship abandoned on the high seas  ( abandoned ship , derelict )
   a ship abandoned on the high seas
   
   
2. A person without a home, job, or property  ( derelict )
   a person without a home, job, or property
   

 gravity bomb gravity bomb /ˈɡrævɪti bɔm/

noun

1. A bomb that falls because of gravity and is not guided to a target  ( dumb bomb , gravity bomb )
   a bomb that falls because of gravity and is not guided to a target
   
   

 aphelion aphelion /əˈfiːliən/

noun

1. Apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun  ( aphelion )
   apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun
   
   

 coupling coupling /ˈkʌplɪŋ/

noun

1. () A connection (like a clamp or vise) between two things so they move together  ( yoke , coupling )
   a connection (like a clamp or vise) between two things so they move together
    The mechanic was busy ensuring the proper coupling of the train carriages.
   The mechanic was busy ensuring the proper coupling of the train carriages.
   
   
2. The act of pairing a male and female for reproductive purposes  ( conjugation , coupling , pairing , mating , sexual union , union )
   the act of pairing a male and female for reproductive purposes
    The casual couplings of adolescents
   the casual couplings of adolescents
    The mating of some species occurs only in the spring
   the mating of some species occurs only in the spring
   
   
3. A mechanical device that serves to connect the ends of adjacent objects  ( coupler , coupling )
   a mechanical device that serves to connect the ends of adjacent objects