Noun hobby has 3 senses
  1. avocation, by-line, hobby, sideline, spare-time activity - an auxiliary activity
    --1 is a kind of pastime, interest, pursuit
    --1 has particulars: speleology, spelaeology
  2. hobby, hobbyhorse, rocking horse - a child's plaything consisting of an imitation horse mounted on rockers; the child straddles it and pretends to ride
    --2 is a kind of plaything, toy
    --2 has parts: rocker
  3. hobby, Falco subbuteo - small Old World falcon formerly trained and flown at small birds
    --3 is a kind of falcon
    --3 is a member of Falco, genus Falco
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