This is an article from the public domain Easton's Bible Dictionary, originally published in 1897.
This article is written from a nineteenth century Christian viewpoint, and may not reflect modern opinions or recent discoveries in Biblical scholarship.
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Wave offerings - parts of peace-offerings were so called, because they were waved
by the priests (Ex. 29:24, 26, 27; Lev. 7:20-34; 8:27; 9:21;
10:14, 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)