|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.|
|aerology (â-rŏl'ə-jē) Pronunciation Key
The branch of meteorology that studies the total vertical extent of the Earth's atmosphere as opposed to the atmosphere near the Earth's surface only. The most commonly studied atmospheric factors in aerology are air temperature, atmospheric pressure, humidity, wind, and ozone levels. Radioactivity and some aspects of long-wave radiation are also studied.