ponderable

from WordNet (r) 3.0 (2006)

ponderable
    adj 1: capable of being weighed or considered; "something
           ponderable from the outer world--something of which we
           can say that its weight is so and so"- James Jeans [ant:
           {imponderable}]
    2: capable of being thought about; "space flight to other
       galaxies becomes more cogitable" [syn: {cogitable},
       {ponderable}]

from The Collaborative International Dictionary of English v.0.48

Ponderable \Pon"der*a*ble\, a. [L. ponderabilis: cf. F.
   pond['e]rable.]
   Capable of being weighed; having appreciable weight. --
   {Pon"der*a*ble*ness}, n.
   [1913 Webster]