"Oh, for goodness sake!", said Alice, "I mean what I say and I say what I mean - it's the same thing!"
Cherry picking definitions will get us nowhere. Let's have a match:
Definitions of oblong on the Web:
"(of a leaf shape) having a somewhat elongated form with approximately parallel sides
a plane figure that deviates from a square or circle due to elongation
wordnetweb.princeton.edu/perl/webwn [score 1 to rectangular]
Something with an oblong shape; A rectangle having length greater than width; Describing something that is longer than it is wide; Roughly rectangular or ellipsoidal
en.wiktionary.org/wiki/oblong [Score 2 to rectangular]
oblongness - rectangularity: the property of being shaped like a rectangle
wordnetweb.princeton.edu/perl/webwn [Score 3 to rectangular]
of the leaves, when the sides of the leaves are parallel and narrow abruptly at both ends [image] of the buds, when the buds are ± cylindrical with parrallel sides
http://www.publish.csiro.au/samples/euc ... ossary.htm [Score 4 to rectangular 4--0]
having the shape of or resembling a rectangle or ellipse
http://www.inhs.uiuc.edu/cbd/musselmanual/glossary.html [Score one each to rectangular and sort-of-circular: 5-1]
At least twice as long as broad, with parallel sides.
http://www.t-c-m-rd.co.uk/resources/glossary/ [Score 6-1]
an (approximately) right-angled, 4-sided shape; longer than broad with opposite sides (roughly) parallel; often rounded near the ends.
http://www.understorey-network.org.au/b ... ssary.html [Score 7-1]
A leaf shape that is an elongated circle.
http://www.cnr.uidaho.edu/what-is-range ... ossary.doc [Score 7-2]
much longer than broad, with nearly parallel sides.
http://www.life.illinois.edu/moss-guide ... ssary.html [Score 8-2]
Object with round ends and parallel margins, three times longer than wide.
botany.csdl.tamu.edu/FLORA/taes/tracy/610/glossO.html [Score 9-2]
Broadest at the middle, and tapering at both ends, but broader than elliptic.
http://www.bio.brandeis.edu/fieldbio/Aq ... ssary.html [Score 9-3]
elliptical, blunt at each end, and being two to four times longer than broad
http://www.marinebiodiversity.ca/BayOfF ... ossMA.html [Score 9-4]
Elongate in form with sides parallel or nearly so, the ends more or less blunted and not tapering
http://www.centenary.edu/arboretum2/mai ... onary.html [Score 10-4]
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I don'think that would deserve a rematch, even if there was a second game on home turf for Elliptical United.
The use of 'oblong' to mean like an ellipse is
botanical jargon.
So, if you are discussing leaves, use 'oblong' for like an ellipse.
But when it's craters, oblong means 'squarish ', WHICH THESE ARE NOT!
John