bottom-up

from WordNet (r) 3.0 (2006)

bottom-up
    adj 1: of an approach to a problem that begins with details and
           works up to the highest conceptual level; "bottom-up
           parser"; "a bottom-up model of the reading process" [ant:
           {top-down}]

from The Collaborative International Dictionary of English v.0.48

bottom-up \bottom-up\ adj. (Computers)
   planning or building the smallest parts first; as, bottom-up
   programming. Opposite of {top-down}.
   [WordNet 1.5] Bottony

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