Sibrwd, n. soft murmur, whisper
Sibwl, n. young onions
Siciad, Siciant, n. a steeping
Sicio, v. to steep, to soak
Sicion, n. steepings, washings
Sicl, n. a shekel
Sicr, a. sure, certain
Sicrwydd, n. certainty
Sid, n. a winding, a round
Sidan, n. silk, satin