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A large division of Mollusca, including all except the bivalves; -- so called because the head is distinctly developed. See Illustration in Appendix.

Having a head.

The texan guan (Ortalis vetula). [written also chiacalaca.]

The place on an ovule, or seed, where its outer coats cohere with each other and the nucleus.

Of or pertaining to the chalaza.

Same as Chalaza.

Having or bearing chalazas.

A small circumscribed tumor of the eyelid caused by retention of secretion, and by inflammation of the Melbomian glands.

undation in which the pollen tube penetrates to the embryosac through the tissue of the chalaza, instead of entering through the micropyle. It was originally discovered by Treub in Casuarina, and has since been found to occur regularly in the families Betulaceæ and Juglandaceæ. Partial chalazogamy is found in Ulmus, th…

A compound of chloral and formic amide used to produce sleep.

A cicada. See Cicada. "At eve a dry cicala sung." Tennison.

Capable of being concealed.

Capable of being congealed. --Con*geal"a*ble*ness, n.

ght or power; to counteract the power or effect of; to countervail; to equiponderate; to balance. The remaining air was not able to counterbalance the mercurial cylinder. Boyle. The cstudy of mind is necessary to counterbalance and correct the influence of the study of nature. Sir W. Hamilton.

A genus of leguminous plants; rattlebox.

Didascalic. [R.]

The genus to which belongs the single species D. Camphora, a lofty resinous tree of Borneo and Sumatra, yielding Borneo camphor and camphor oil.

Without palpi.

Belonging to, or designed for, an epithalamium.

ong, or poem in honor of the bride and bridegroom. The kind of poem which was called epithalamium . . . sung when the bride was led into her chamber. B. Jonson.