analog

Short definition from Wiktionary

Adjective

1. 1
   In which the value of a data item (such as time) is represented by a continuous(ly) variable physical quantity that can be measured (such as the shadow of a sundial).
2. 2
   Not relating to, or pre-dating, digital technology such as computers and the Internet; relating to real life.

Noun

1. 1
   Something that bears an analogy to something else.
2. 2
   An organ or structure that is similar in function to one in another kind of organism but is of dissimilar evolutionary origin.
3. 3
   A structural derivative of a parent compound that differs from it by only one or a few atoms or substituent groups; (usually, especially) such a molecule that retains most of the same chemical properties.