main frame

noun

The rigid frame upon which the moving parts of a machine are mounted; a chassis.

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Meanings

nounmain frame (plural main frames)

plural main frames

  1. engineeringThe rigid frame upon which the moving parts of a machine are mounted; a chassis.

    The main frames are of 1¼-in. thick plates spaced 3 ft. 2½ in. apart, the centre lines coinciding with the centre of the axlebox guide faces.

    1951 March, “British Railways Standard "Britannia" Class 4-6-2 Locomotives”, in Railway Magazine, page 186
  2. businessThe widest structural frame located near the middle of a ship.
  3. alternativeAlternative form of mainframe.
Cite this entry
APA

main frame. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/main%20frame

MLA

“main frame.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/main%20frame. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “main frame,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/main%20frame.

Source: main frame on Wiktionary, CC BY-SA 4.0.