Wave offerings

Parts of peace-offerings were so called, because they were waved by the priests (Ex 29:24, Ex 29:26, Ex 29:27; Lev 7:20–34; Lev 8:27; Lev 9:21; Lev 10:14, Lev 10:15, etc.), in token of a solemn special presentation to God. They then became the property of the priests. The first-fruits, a sheaf of barley, offered at the feast of Pentecost (Lev 23:17–20), and wheat-bread, the first-fruits of the second harvest, offered at the Passover (10-14), were wave-offerings.

From Easton’s Bible Dictionary (1897), by Matthew George Easton.