out-of-roundadj.n.
/ˌaʊtəvˈraʊnd/, U.S. /ˌaʊdə(v)ˈraʊnd/ A. adj.
Of an object: not perfectly circular, cylindrical, or spherical. Frequently without hyphens and in predicative use.
ΘΚΠ
the world > space > shape > curvature > roundness > [adjective] > not round
unround1588
out-of-round1734
uncircular1775
1734 J. T. Desaguliers Course Experim. Philos. I. iv. 202 The Wheel moves from Side to Side, which comes to the same as if the Wheel was out of round.
1825 Mechanics' Mag. 12 Mar. 391/2 The London cutlers almost generally employ glaze-wheels..which are very apt to get out of round.
1896 Anthony's Photogr. Bull. 27 171 No matter..how skillfully the blades be selected, if they are allowed to become dull and out of round, it will be impossible to do good sawing.
1900 Trans. New Eng. Cotton Manufacturers' Assoc. No. 68 313 Rings slightly out of round are to be preferred to rings not level on the rails.
1955 W. H. Crouse Automotive Engines xiv. 403 Some bearing failures may result..from a tapered or out-of-round crankpin.
1986 Target Gun Aug. 72/1 Shot was a little out of round, no problem for skeet.
2004 P. Sweeney Gunsmithing (ed. 2) xi. 167/2 A rough, undersized, or out of round chamber can stop even a factory cartridge.
B. n.
Mechanics. The quality of departing from being exactly circular in section, on the part of a cylindrical or circular manufactured object; spec. the extent of this.
ΘΚΠ
the world > space > shape > curvature > roundness > [noun] > lack of
out-of-roundness1906
out-of-round1916
1916 Bulletin (N.Y. State Industr. Comm.) Sept. 14/2 If the saw is filed by an inexperienced workman, it will have long and short teeth, producing what is known in the trade as ‘out of round’.
1951 C. W. Kennedy Inspection & Gaging iv. 67 Standards for allowable taper, out-of-round or eccentricity should be established in every shop.
1970 K. Ball Fiat 600, 600D Autobook xi. 130/2 The out-of-round must not exceed ·0004 inch.
2005 E. H. Dorries TechOne: Automotive Engine Repair xxii. 175 If the out of round is beyond the allowable limit the engine should be bored.
Derivatives
ˌout-of-ˈroundness n. Mechanics the degree to which something is out of round; the property of being out of round.
ΘΚΠ
the world > space > shape > curvature > roundness > [noun] > lack of
out-of-roundness1906
out-of-round1916
1906 Trans. Amer. Soc. Mech. Engin. 27 754 These entries were made up from the measurements made for out-of-roundness of tube.
1929 Pop. Mech. May 840/1 If a cylinder does not hold compression, it should be removed, carefully checked for scoring and ‘out-of-roundness’, and new pistons substituted.
1955 W. H. Crouse Automotive Engines xiv. 412 Bearings working against out-of-roundness or taper of more than 0·0015 inch will not last long.
2003 M. Küsel & E. Brommundt in K. Popp & W. Schiehlen Syst. Dynamics & Long-term Behaviour Railway Vehicles 121 The wear on the wheel tread will not be dealt with separately for the profile and the out-of-roundnesses.
This entry has been updated (OED Third Edition, December 2004; most recently modified version published online March 2022).
<
adj.n.1734