Sylweddoliaeth, n. materialism
Sylweddu, to make of substance
Sylwi, v. to observe, to regard
Sylwiad, n. an observing
Syll, n. a view; a gaze, a stare
Syllbeiriant, n. an optical instrument
Sylldy, n. a shop
Sylliant, n. an observation
Syllio, v. to observe; to gaze
Syllt, n. what is fair or clear