Tresses are long flowing hair. A word from romance and shampoo advertisements rather than from ordinary speech.
It is always plural and it is always admiring, which is why it survives almost entirely in poetry, fairy tales and marketing. Nobody describes their own hair this way without smiling. Strictly a tress is a lock or a plait of hair, and the plural came to mean the whole head of it. Rapunzel is the story the word belongs to more than any other.
1nountressesLong flowing hair.
“The portrait shows her with tresses down to her waist.”
Ancient Greek
τριχία — rope
Vulgar Latin
*trichia
Old French
tresce
Middle English
tresse
English
tress
English, today
tresses
Built from
tress comes from Middle English tresse, from Old French tresce, of uncertain origin; possibly from Vulgar Latin trichia, from Ancient Greek τριχία (“rope”), from θρίξ (“hair”). Compare French tresse, Italian treccia.
Etymology from Wiktionary, CC BY-SA