What is the meaning of Attractor?

Something which attracts.

A set of points or states to which a dynamical system evolves after a long enough time. That is, points that get close enough to the attractor remain close even if slightly disturbed.

first-person singular present passive indicative of attractō

Pre-reform spelling (used until 1943 in Brazil and 1911 in Portugal) of atrator.

Pre-reform spelling (used until 1943 in Brazil and 1911 in Portugal) of atrator.

Source: wiktionary.org