No definitions found for 'aerological instrument'
Perhaps one of these:
aerialist,
aerology,
aral sea,
aerial acid,
arles,
aerologist,
arilus,
air lock,
arillus,
arilus cristatus,
airlock,
airlike,
aurelius,
aralia spinosa,
arales,
airless,
aerial sickness,
ariel gazelle,
aralia hispida,
arles penny,
arial, sc,
araliaceae,
aralia schinseng,
aralia stipulata,
aerologic,
aerological