Search the Dictionary

The anterior region or head of insects and other arthropods. Packard.

The anterior end of the notochord and its bony sheath in the base of cartilaginous crania.

The anterior portion of any one of the Arachnida and higher Crustacea, consisting of the united head and thorax.

The anterior, and in man the larger, division of the brain; the seat of the reasoning faculties and the will. See Brain.

athe by means of lungs, and bring forth living young which they suckle for some time. The anterior limbs are changed to paddles; the tail flukes are horizontal. There are two living suborders: (a) The Mysticete or whalebone whales, having no true teeth after birth, but with a series of plates of whalebone [see Baleen.]…

An order of mammalia, including the bats, having four toes of each of the anterior limbs elongated and connected by a web, so that they can be used like wings in flying. See Bat.

One of the anterior pair of mouth organs, terminated by a pincherlike claw, in scorpions and allied Arachnida. They are homologous with the falcers of spiders, and probably with the mandibles of insects.

One of a pair of male copulatory organs, developed on the anterior side of the ventral fins of sharks and other elasmobranchs. See Illust. of Chimæra.

An order of insects having the anterior pair of wings (elytra) hard and horny, and serving as coverings for the posterior pair, which are membranous, and folded transversely under the others when not in use. The mouth parts form two pairs of jaws (mandibles and maxillæ) adapted for chewing. Most of the Coleoptera are k…

(Anat.), a formen in front of each condyle of the occipital bone; -- sometimes called the anterior condylar foramen when a second, or posterior, foramen is present behind the condyle, as often happens in man.

The anterior rib in the wing of an insect.

s. They are found chiefly in countris inhabited by the ancient Celts, and are of a period anterior to the introduction of Christianity into these countries.

An insect which has the anterior pair of wings coriaceous, and does not use them in flight, as the earwig.

An order of lamellibranchiate mollusks having an anterior and posterior adductor muscle, as the common clam. See Bivalve.

The anterior surface or oral area of coelenterate animals, as of sea anemones.

One of the anterior pair of wings in the Coleoptera and some other insects, when they are thick and serve only as a protection for the posterior pair. See Coleoptera.

Having the anterior scutes extending around the tarsus on the inner side; -- said of certain birds.

An order of insects, including the earwig. The anterior wings are short, in the form of elytra, while the posterior wings fold up beneath them. See Earwig.

Having the anterior scute

y Process; h Iris; i Suspensory Ligament; k Prosterior Aqueous Chamber between h and i; l Anterior Aqueous Chamber; m Crystalline Lens; n Vitreous Humor; o Retina; p Yellow spot; q Center of blind spot; r Artery of Retina in center of the Optic Nerve.