Glideslope is valid Scrabble Word

Is glideslope a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List YES
Collins Scrabble Words NO
Is glideslope valid Words with Friends?
Words with Friends NO

Definitions for GLIDESLOPE in dictionary:

Words that contain GLIDESLOPE

glideslopes15
Find what other words can be done using letters: "glideslope"
https://scrabble-word.com/finder/glideslope
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