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Any fermentation process by which ammonia is formed, as that by which urea is converted into ammonium carbonate when urine is exposed to the air.

That group of vertebrates which develops in its embryonic life the envelope called the amnion. It comprises the reptiles, the birds, and the mammals.

One of the classes of vertebrates.

Having both ends concave; biconcave; -- said of vertebræ.

lancelet. Its body is pointed at both ends. It is the lowest and most generalized of the vertebrates, having neither brain, skull, vertebræ, nor red blood. It forms the type of the group Acrania, Leptocardia, etc.

Having the ovule inverted, but with the attachment near the middle of one side; half anatropous.

The arc of the horizon between the true east or west point and the foot of the vertical circle passing through any star or object.

ntertain or occupy in a pleasant manner; to stir with pleasing or mirthful emotions; to divert. A group children amusing themselves with pushing stones from the top [of the cliff], and watching as they plunged into the lake. Gilpin.

Diverted.

Giving amusement; diverting; as, an amusing story. -- A*mus"ing*ly, adv.

s the bottom of an anaclastic glass. Anaclastic glass, a glass or phial, shaped like an inverted funnel, and with a very thin convex bottom. By sucking out a little air, the bottom springs into a concave form with a smart crack; and by breathing or blowing gently into the orifice, the bottom, with a like noise, springs…

The division of Vertebrata in which no allantois is developed. It includes amphibians, fishes, and lower forms.

An accessory process in many lumbar vertebræ.

An anarch; one who advocates anarchy of aims at the overthrow of civil government.

Overthrowing; defeating; -- applied to Plato's refutative dialogues. Enfield.

Having the ovule inverted at an early period in its development, so that the chalaza is as the apparent apex; -- opposed to orthotropous. Gray.

The difference of direction of two lines. In the lines meet, the point of meeting is the vertex of the angle.

To convert into English; to anglicize. Franklin. Darwin.

drawn to the body. -- Angular point, the point at which the sides of the angle meet; the vertex. -- Angular velocity, the ratio of anuglar motion to the time employed in describing.

To convert into animal matter by the processes of assimilation.