Webster's English Dictionary

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astronaut

as.tro.naut \'as-tr*-.no.t, -.na:t\ \.as-tr*-'no.t-i-k*l, -'na:t-\ 
   \-k(*-)le-\ n [astr- + -naut (as in aeronaut)] : a traveler in 
   interplanetary space  - as.tro.nau.ti.cal aj