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