D defs.my
Entry 3 senses Webster, 1913

Erector

/ĭr-ĕk'-tẽr/ · E·rec·tor · IPA /ɪrˈɛktər/
01 n. One who, or that which, erects.
  1. 1.
    One who, or that which, erects.
  2. 2.
    A muscle which raises any part.(Anat.)
  3. 3.
    An attachment to a microscope, telescope, or other optical instrument, for making the image erect instead of inverted.(Physics)