Think of the layer of air that sits above the clouds and above all the weather we feel — the height where the sky looks dark blue and a big plane is still climbing. That height is the whole word. Point it at the air and you get the science meaning; point it at a price and you get a number that has gone up there too.
From the word’s history
The source gives stratosphere + -ic, where -ic turns a noun into an adjective meaning 'of or belonging to'. So the word is built directly on the name of that layer of air.
來源資料寫這個字是 stratosphere 加上字尾 -ic，-ic 的作用是把名詞變成形容詞，意思是「屬於…的」。所以這個字從頭到尾都建在那一層空氣的名字上。
Wiktionary entry for stratospheric, etymology: “From stratosphere + -ic (suffix meaning ‘of or pertaining to’ forming adjectives from nouns).” (packet ref kaikki:3f6f69a190036ae4:1147541812:13706)
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