From, raqaq in its original sense; a thin cake; -- cake, wafer.
see HEBREW raqaq
H7550. raqiq
רָקִיק noun masculine a thin cake, (RV) wafer (compare Arabic a thin round cake of bread), always of unleavened bread: Exodus 29:23 = Leviticus 8:26 אֶחָד מַצָּה רְקִיק ׳ר, אֶחָד Numbers 6:19, מַצּוֺת רְקִיקֵי Exodus 29:2; Leviticus 2:4; 7:12; Numbers 6:15 (all P), 1 Chronicles 23:29. — ᵐ5 λάγανον.