Radiate-veined (a.)
definition: Having the principal veins radiating
Or diverging from the apex of the petiole; -- said of such leaves as those of the grapevine most maples and the castor-oil plant.
Radiate-veined is a 14 letter word that begins with an R and ends in a D

Ranunculaceous (a.)
definition: Of or pertaining to a natural order of plants (Ranunculaceae)
Of which the buttercup is the type and which includes also the virgin's bower the monkshood larkspur anemone meadow rue and peony.
Ranunculaceous is a 14 letter word that begins with an R and ends in an S

Rattle-brained (a.)
definition: Giddy; rattle-headed.

Rattle-brained is a 14 letter word that begins with an R and ends in a D

Reasonableness (n.)
definition: Quality of being reasonable.

Reasonableness is a 14 letter word that begins with an R and ends in an S

Recalcitration (n.)
definition: A kicking back again; opposition; repugnance; refractoriness.

Recalcitration is a 14 letter word that begins with an R and ends in an N

Recapitulation (n.)
definition: The act of recapitulating; a summary
Or concise statement or enumeration of the principal points facts or statements in a preceding discourse argument or essay.
Recapitulation is a 14 letter word that begins with an R and ends in an N

Recapitulatory (a.)
definition: Of the nature of a recapitulation; containing recapitulation.

Recapitulatory is a 14 letter word that begins with an R and ends in a Y

Reciprocalness (n.)
definition: The quality or condition of being reciprocal; mutual return; alternateness.

Reciprocalness is a 14 letter word that begins with an R and ends in an S

Reciprocornous (a.)
definition: Having horns turning backward and then forward
Like those of a ram.
Reciprocornous is a 14 letter word that begins with an R and ends in an S

Recolonization (n.)
definition: A second or renewed colonization.

Recolonization is a 14 letter word that begins with an R and ends in an N

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