Search the Dictionary

Like or pertaining to the nautilus; shaped like a nautilus shell. -- n.

s are found living in the tropical Pacific, but many other species are found fossil. The shell is spiral, symmetrical, and chambered, or divided into several cavities by simple curved partitions, which are traversed and connected together by a continuous and nearly central tube or siphuncle. See Tetrabranchiata.…

uth, lead, and copper occuring in acicular crystals; -- called also aikinite. -- Needle shell (Zoöl.), a sea urchin. -- Needle spar (Min.), aragonite. -- Needle telegraph, a telegraph in which the signals are given by the deflections of a magnetic needle to the right or to the left of a certain position. -- Sea nee…

A division of vermiform gastropod mollusks, without a shell, belonging to the Isopleura.

A genus including numerous species of shells resembling Nerita in form. They mostly inhabit brackish water, and are often delicately tinted.

hewing. They feed upon other insects, and undergo a complete metamorphosis. The ant-lion, hellgamite, and lacewing fly are examples. Formerly, the name was given to a much more extensive group, including the true Neuroptera and the Pseudoneuroptera.

A rounded seed, rather smaller than a nutmeg, having a hard smooth shell, and a yellowish or bluish color. The seeds grow in the prickly pods of tropical, woody climbers of the genus Cæsalpinia. C. Bonduc has yellowish seeds; C.Bonducella, bluish gray. [Spelt also neckar nut, nickar nut.]

t together or closed; to pinch; to close in upon. May this hard earth cleave to the Nadir hell, Down, down, and close again, and nip me flat, If I be such a traitress. Tennyson.

of Biblical history, in the time of the Deluge. Noah's ark. (a) (Zoöl.) A marine bivalve shell (Arca Noæ), which somewhat resembles an ark, or ship, in form. (b) A child's toy, consisting of an ark-shaped box containing many different wooden animals.

Resembling in form or structure a foraminiferous shell of the genus Nodosaria. -- n. (Zoöl.)

The tip, or earliest part, of a univalve or bivalve shell.

A genus of small marine bivalve shells, having a pearly interior.

A division of opisthobranchiate mollusks, having no shell except while very young. The gills are naked and situated upon the back or sides. See Ceratobranchia.

A genus of extinct Tertiary Foraminifera, having a thin, flat, round shell, containing a large number of small chambers arranged spirally.

the almond, walnut, hickory, beech, filbert, etc.), consisting of a hard and indehiscent shell inclosing a kernel.

More than enough; abundant. [Obs.] If a man were porter of hell gate, he should have old turning the key. Shak.

A genus of polished marine gastropod shells, chiefly tropical, and often beautifully colored.

Any shell of the genus Oliva and allied genera; -- so called from the form. See Oliva.

e oviduct of certain trematode worms in which the ova are completed and furnished with a shell.

Having an operculum, or an apparatus for protecting the gills; -- said of shells and of fishes.