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