Brown-Driver-Briggs
[
רִקּוּעַ]
noun [masculine] expansion; — plural construct
וְעָשׂוּ אֹתָם רִקֻּעֵי פַחִים Numbers 17:3 expansions of plates, i.e. they shall be beaten into
broad plates. I. רקק (√of following; Arabic
be thin, also figurative be weak, slender, scanty, etc.; Ethiopic
be thin,
thin; Syriac
Pa`el, Aph`el make thin,
thin).