n. the outer region of the earth's atmosphere, beyond which is the exosphere; it contains a high concentration of free electrons and ions, and extends from about 50 miles to about 250 miles above the earth's surface, but the height shows daily and seasonal variation, and the composition of the particles in the ionosphere is also affected by events such as solar flares. [ WordNet 1.5 +PJC ]
[Ā pǔ ěr dùn, ㄚ ㄆㄨˇ ㄦˇ ㄉㄨㄣˋ, 阿普尔顿 / 阿普爾頓] Appleton (name); Sir Edward Appleton (1892-1965), British physicist, Nobel laureate who discovered the ionosphere#319,182[Add to Longdo]
You know the meaning of this word? click [add this word] to add this word to our database with its meaning, to impart your knowledge for the general benefit
แสดงได้ทั้งความหมายของคำเดี่ยว และคำผสม ได้อย่างถูกต้อง
เช่น Secretary of State=รัฐมนตรีต่างประเทศของสหรัฐฯ (ในภาพตัวอย่าง),
High school=โรงเรียนมัธยมปลาย
