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- English Word Rosenmuller's organ Definition The parovarium.
- English Word Roseo- Definition A prefix (also used adjectively) signifying rose-red; specifically used to designate certain rose-red compounds (called roseo-cobaltic compounds) of cobalt with ammonia. Cf. Luteo-.
- English Word Roseola Definition A rose-colored efflorescence upon the skin, occurring in circumscribed patches of little or no elevation and often alternately fading and reviving; also, an acute specific disease which is characterized by an eruption of this character; -- called also rose rash.
- English Word Roser Definition A rosier; a rosebush.
- English Word Roseroot Definition A fleshy-leaved herb (Rhodiola rosea); rosewort; -- so called because the roots have the odor of roses.
- English Word Rosery Definition A place where roses are cultivated; a nursery of roses. See Rosary, 1.
- English Word Roset Definition A red color used by painters.
- English Word Rosetta wood Definition An east Indian wood of a reddish orange color, handsomely veined with darker marks. It is occasionally used for cabinetwork.
- English Word Rosette Definition An imitation of a rose by means of ribbon or other material, -- used as an ornament or a badge.
- English Word Rosette Definition An ornament in the form of a rose or roundel, -much used in decoration.
- English Word Rosette Definition A red color. See Roset.
- English Word Rosette Definition A rose burner. See under Rose.
- English Word Rosette Definition Any structure having a flowerlike form; especially, the group of five broad ambulacra on the upper side of the spatangoid and clypeastroid sea urchins. See Illust. of Spicule, and Sand dollar, under Sand.
- English Word Rosette Definition A flowerlike color marking; as, the rosettes on the leopard.
- English Word Rosewood Definition A valuable cabinet wood of a dark red color, streaked and variegated with black, obtained from several tropical leguminous trees of the genera Dalbergia and Machaerium. The finest kind is from Brazil, and is said to be from the Dalbergia nigra.
- English Word Roseworm Definition The larva of any one of several species of lepidopterous insects which feed upon the leaves, buds, or blossoms of the rose, especially Cacaecia rosaceana, which rolls up the leaves for a nest, and devours both the leaves and buds.
- English Word Rosewort Definition Roseroot.
- English Word Rosewort Definition Any plant nearly related to the rose.
- English Word Rosicrucian Definition One who, in the 17th century and the early part of the 18th, claimed to belong to a secret society of philosophers deeply versed in the secrets of nature, -- the alleged society having existed, it was stated, several hundred years.
- English Word Rosicrucian Definition Of or pertaining to the Rosicrucians, or their arts.