Etymology
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*kreue- 

*kreuə-, Proto-Indo-European root meaning "raw flesh."

It forms all or part of: 

creatine; creosote; crude; cruel; ecru; pancreas; raw; recrudesce; recrudescence.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit kravis- "raw flesh," krura- "raw, bloody;" Greek kreas "flesh;" Latin crudus "bloody, raw; cruel," cruor "thick blood;" Old Irish cru "gore, blood," Middle Irish cruaid "hardy, harsh, stern;" Old Church Slavonic kry "blood;" Old Prussian krawian, Lithuanian kraūjas "blood;" Old English hreaw "raw," hrot "thick fluid, serum."

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*bhel- (3)
Proto-Indo-European root meaning "to thrive, bloom," possibly a variant of PIE root *bhel- (2) "to blow, swell."

It forms all or part of: blade; bleed; bless; blood; blow (v.2) "to bloom, blossom;" bloom (n.1) "blossom of a plant;" bloom (n.2) "rough mass of wrought iron;" blossom; cauliflower; chervil; cinquefoil; deflower; defoliation; effloresce; exfoliate; feuilleton; flora; floral; floret; florid; florin; florist; flour; flourish; flower; foil (n.) "very thin sheet of metal;" foliage; folio; folium; gillyflower; Phyllis; phyllo-; portfolio; trefoil.

It is the hypothetical source of/evidence for its existence is provided by: Greek phyllon "leaf;" Latin flos "flower," folio, folium "leaf;" Middle Irish blath, Welsh blawd "blossom, flower;" Gaelic bile "leaflet, blossom;" Old English blowan "to flower, bloom."
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