RHAMPHORHYNCHUS
Rham`pho*rhyn"chus, n. Etym: [NL., fr. Gr. (Paleon.)
Defn: A genus of pterodactyls in which the elongated tail supported a leathery expansion at the tip.
RHAMPHOTHECA
Rham`pho*the"ca, n.; pl. Rhamphothecæ. Etym: [NL., fr. Gr (Zoöl.)
Defn: The horny covering of the bill of birds.
RHAPHE
Rha"phe, n. Etym: [NL., fr. Gr. (Bot.)
Defn: The continuation of the seed stalk along the side of an anatropous ovule or seed, forming a ridge or seam. [Written also raphe.] Gray.
RHAPHIDES
Rhaph"i*des, n. pl. Etym: [NL., fr. Gr. raphides.] (Bot.)
Defn: Minute transparent, often needlle-shaped, crystals found in the tissues of plants. [Written also raphides.]
RHAPONTICINE
Rha*pon"ti*cine (, n. Etym: [L. rhaponticum rhubarb. See Rhubarb.]
(Chem.)
Defn: Chrysophanic acid.