A shape that has been pulled long. Take a circle and stretch it, or take a square and stretch it — either way one direction is now clearly longer than the other, and the eye follows that length. Everything the word does sits on that stretch: describing a leaf, a table or a field, and naming the long patch itself.
From Middle English oblong, borrowed from Latin oblongus.
維基詞典記載它來自拉丁文 oblongus，經中古英語進入英文。字裡看得到 long 的影子，跟「被拉長」的核心畫面對得上。
Wiktionary entry for oblong (packet etymology_text: From Middle English oblong, oblonge, borrowed from Latin oblongus.)
One branch
形容一個形狀是長的
這一支是核心畫面直接當形容詞用。兩個意思的差別不在畫面，在說話的人是哪裡的英文。
adjective · B2
Stretched out in one direction — much longer than it is wide. In American English this covers rounded shapes as well as straight-sided ones, so a long thin leaf, a long oval dish and a long rectangle can all be called oblong.
長形的；長橢圓的