English
trained
From train + -ed.
A compound of train + -ed
Latin trahō ‘to pull, to draw’
…
Vulgar Latin *traginō
Old French trainer ‘to pull out, to draw’
Old French train ‘a delay, a drawing out’
Middle English trayne ‘train’
English train
Today it means
adj Having undergone a course of training (sometimes in combination).
Language periods are conventional ranges, not dates for this word.
Etymograph / trained