par·al·lax (p r  -lks )n. An apparent change in the direction of an object, caused by a change in observational position that provides a new line of sight. [French parallaxe, from Greek parallaxis, from parallassein, to change : para-, among; see para-1 + allassein, to exchange (from allos, other; see al-1 in Indo-European roots).] par al·lactic (-lkt k) adj. |   The apparent position of a star among more distant stars changes when viewed from opposite sides of the earth's orbit. |
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