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A large tree of the genus Swietenia (S. Mahogoni), found in tropical America.

History of the evolution of forms; that part of ontogeny that deals with the germ history of forms; -- distinguished from physiogeny. Haeckel.

ndulus, and of allied genera; the killifishes; -- called also minnow. [Written also mummychog, mummachog.]

See Mummichog.

A composer of fables.

An instrument for determining and registering the duration of more or less complex operations of the mind. Dunglison.

A division of serpents which have some of the posterior maxillary teeth grooved for fangs.

A writing upon the back of anything, as upon the back of a leaf or sheet already written upon on one side. [R.] Scudamore.

Direct fertilization in plants, as when the pollen fertilizing the ovules comes from the stamens of the same blossom; -- opposed to heterogamy.

Orthognathous.

The quality or state of being orthognathous. Huxley.

Having the front of the head, or the skull, nearly perpendicular, not retreating backwards above the jaws; -- opposed to Ant: prognathous. See Gnathic index, under Gnathic.

A rectangular figure.

Right-angled; rectangular; as, an orthogonal intersection of one curve with another. Orthogonal projection. See under Orthographic.

Perpendicularly; at right angles; as, a curve cuts a set of curves orthogonally.

An orthographic projection, sometimes partly in section, esp. of a building.

One versed in orthography; one who spells words correctly.

Of or pertaining to orthography, or right spelling; also, correct in spelling; as, orthographical rules; the letter was orthographic.

In an orthographical manner:

One who spells words correctly; an orthographer.