centra

noun
  1. 1

    A center.

  2. 2

    The central body of a vertebra; the solid piece to which the arches and some other parts are or may be attached.

  3. 3

    The basis or fundamental portion of one of the cranial segments, regarded as analogous to vertebrae.

  4. 4

    The focus or place of origin of an earthquake.

Source: https://en.wiktionary.org/wiki/centra, https://en.wiktionary.org/wiki/centrum