This is the 1968th most frequent French word.
sèche
"Sèche" means "dry" or "dryer" in English.
Here, 'sèche' is part of the compound noun 'sèche-cheveux', which means 'hairdryer'.
Elle utilise un sèche-cheveux après la douche.
She uses a hairdryer after the shower.
In this case, 'sèche' is an adjective describing the noun 'salade', meaning 'dry'.
La salade est un peu sèche aujourd'hui.
The salad is a bit dry today.
In this sentence, 'sèche' is used colloquially as part of the noun 'une sèche', meaning 'an intentional act of skipping something' like a class or meeting.