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One versed in orchidology.

The branch of botany which treats of orchids.

Chrysolite.

An eruptive rock characterized by the presence of chrysolite (peridot). It also usually contains pyroxene, enstatite, chromite, etc. It is often altered to serpentine.

An instrument for studying the motions of sounding bodies by optical means. It consists of a tube across the end of which is stretched a film of soap solution thin enough to give colored bands, the form and position of which are affected by sonorous vibrations.

Same as Protoza.

A coral, or corallum; also, one of the coral-like structure made by bryozoans and hydroids.

One who makes provision; a purveyor. [R.] De Foe.

One who is versed in pteridology.

That department of botany which treats of ferns.

A madness, craze, or strong fancy, for ferns. [R.] C. Kingsley.

A class of flowerless plants, embracing ferns, horsetails, club mosses, quillworts, and other like plants. See the Note under Cryptogamia. -- Pter"i*do*phyte`, n.

A solid resembling a pyramid; -- called also pyramoid. Barlow.

One of a body of officers charged with the government of Spanish municipalities, corresponding to the English alderman.

A division of gastropod mollusks having a large number of long, divergent, hooklike, lingual teeth in each transverse row. It includes the scutibranchs. See Illustration in Appendix.

isting of music and dancing, -- held generally on fast eves. Brande & C. There are to be ridottos at guinea tickets. Walpole.

A translucent mineral of a green color and micaceous structure, belonging to the chlorite group; a hydrous silicate of alumina, magnesia, and iron; -- called also clinochlore.

A roof or ceiling covering a semicircular room or recess, or one of nearly that shape, as the apse of a church, a niche, or the like. It is approximately the quarter of a hollow sphere.

An office or feast celebrated with less solemnity than the double ones. See Double, n., 8.

An instrument for indicating and recording shocks to railway cars occasioned by sudden stopping.