[1] : The Collaborative International Dictionary of English v.0.48

visible \vis"ible\, a. l. visibilis, fr. videre, visum, to
   see: cf. f. visible. see vision.
   1. perceivable by the eye; capable of being seen;
      perceptible; in view; as, a visible star; the least spot
      is visible on white paper.
      1913 webster

            maker of heaven and earth, and of all things visible
            and invisible.                        --bk. of com.
                                                  prayer.
      1913 webster

            virtue made visible in outward grace. --young.
      1913 webster

   2. noticeable; apparent; open; conspicuous. --shak.
      1913 webster

            the factions at court were greater, or more visible,
            than before.                          --clarendon.
      1913 webster

   visible church theol., the apparent church of christ on
      earth; the whole body of professed believers in christ, as
      contradistinguished from the invisible, or real, church,
      consisting of sanctified persons.

   visible horizon. same as apparent horizon, under
      apparent.
      1913 webster -- vis"ibleness, n. -- vis"ibly,
      adv.
      1913 webster
see also:
vision visible church visible horizon apparent horizon apparent vis"ibleness 
vis"ibly 

[2] : WordNet (r) 2.0

visible
     adj 1: perceptible especially by the eye; or open to easy view; "a
            visible object"; "visible stars"; "mountains visible
            in the distance"; "a visible change of expression";
            "visible files" syn: seeable ant: invisible
     2: obvious to the eye; "a visible change of expression" syn: obvious
     3: being often in the public eye; "a visible public figure"
     4: present and easily available; "the cash on hand is adequate
        for current needs"; "emergency police were on hand in case
        of trouble"; "a visible supply"; "visible resources" syn:
         on handp, visiblea
see also:
seeable invisible obvious on handp visiblea 

[3] : Moby Thesaurus II by Grady Ward, 1.0

72 moby thesaurus words for "visible":
   apparent, appearing, beholdable, clear, clear as crystal,
   conspicuous, crystal-clear, detectable, discernible, disclosed,
   discoverable, distinct, evident, explicit, exposed,
   exposed to view, express, eyeball, hanging out, identifiable,
   in evidence, in full view, in plain sight, in view, indisputable,
   indubitable, insight, manifest, naked, noticeable, observable,
   obvious, ocular, open, open to view, open-and-shut, ophthalmic,
   optic, ostensible, outcropping, outward, palpable, patent,
   perceivable, perceptible, perspicuous, plain, plain as day,
   prominent, recognizable, revealed, seeable, seeing, seeming, seen,
   self-evident, self-explaining, self-explanatory, showing,
   superficial, surface, tangible, to be seen, unclouded, unconcealed,
   undisguised, unhidden, unmistakable, viewable, visual,
   well-defined, witnessable

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