Dictionary » S » Sphere



1. (Science: geometry) A body or space contained under a single surface, which in every part is equally distant from a point within called its center.

2. Hence, any globe or globular body, especially a celestial one, as the sun, a planet, or the earth. Of celestial bodies, first the sun, A mighty sphere, he framed. (milton)

3. (Science: astronomy) The apparent surface of the heavens, which is assumed to be spherical and everywhere equally distant, in which the heavenly bodies appear to have their places, and on which the various astronomical circles, as of right ascension and declination, the equator, ecliptic, etc, are conceived to be drawn; an ideal geometrical sphere, with the astronomical and geographical circles in their proper positions on it. In ancient astronomy, one of the concentric and eccentric revolving spherical transparent shells in which the stars, sun, planets, and moon were supposed to be set, and by which they were carried, in such a manner as to produce their apparent motions.

4. (Science: logic) The extension of a general conception, or the totality of the individuals or species to which it may be applied.

5. Circuit or range of action, knowledge, or influence; compass; province; employment; place of existence. To be called into a huge sphere, and not to be seen to move in 't. (Shak) Taking her out of the ordinary relations with humanity, and inclosing her in a sphere by herself. (Hawthorne) Each in his hidden sphere of joy or woe Our hermit spirits dwell. (Keble)

6. rank; order of society; social positions.

7. An orbit, as of a star; a socket. Armillary sphere, crystalline sphere, oblique sphere,. See Armillary, crystalline,. Doctrine of the sphere, applications of the principles of spherical trigonometry to the properties and relations of the circles of the sphere, and the problems connected with them, in astronomy and geography, as to the latitudes and longitudes, distance and bearing, of places on the earth, and the right ascension and declination, altitude and azimuth, rising and setting, etc, of the heavenly bodies; spherical geometry. Music of the spheres. See music.

Synonym: globe, orb, circle. See globe.

Origin: oe. Spere, OF. Espere, f. Sphere, L. Sphaera,. Gr. A sphere, a ball.

Please contribute to this project, if you have more information about this term feel free to edit this page

Results from our forum

An Overview of Embryonic Stem Cells

... use of culture techniques based on experience with the culture of EC cells . ES cells are derived from the pre-implantation blastocyst, a hollow sphere of cells containing an outer layer of trophoblast cells which give rise to the placenta and the inner cell mass (ICM), from which ES cells are ...

See entire post
by 2444256703
Thu Jan 29, 2015 6:48 am
Forum: Cell Biology
Topic: An Overview of Embryonic Stem Cells
Replies: 0
Views: 554

Newbie question about the first life

Chapter XLZVIII The "primitive boundary" is simply the limit beteween the tiny droplet, globule, globulet, sphere or quasisphere and its surroundings. Those globules are colloidal, meaning that they're the kind of mixture called a "colloid", which is halfway between ...

See entire post
by piscilactovegetarian
Fri Feb 28, 2014 12:10 am
Forum: Molecular Biology
Topic: Newbie question about the first life
Replies: 14
Views: 19158

which mechanism triggers the first cell differentiation?

... humans, approximately four days after fertilization and after several cycles of cell division, these cells begin to specialize, forming a hollow sphere of cells, called a blastocyst but do not explain why they begin to specialize. I could imagine ⋅ that a cell has a "counter" ...

See entire post
by WoJ
Mon Jul 22, 2013 6:18 pm
Forum: Cell Biology
Topic: which mechanism triggers the first cell differentiation?
Replies: 4
Views: 4407


... properties that are unique among prokaryotes. It consists of a compact assembly or aggregate of flagellated bacterial cells, highly organized in a sphere, that swim in either helical or straight trajectories. The life cycle of ‘Candidatus Magnetoglobus multicellularis' is completely multicellular, ...

See entire post
by BlahBlahBlah
Thu Jun 27, 2013 1:46 pm
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 27
Views: 41165

Evolution of the Face and Head

... mammals are deuterostoma (mouth second) and insects protostoma (mouth first): when the embryo develops from a solid ball into a blastula (a hollow sphere) into gastrula a hollow sphere with an opening), the first opening becomes the mouth in protostoma, but the anus in deuterostoma. So after the ...

See entire post
by stauffie
Mon May 07, 2012 12:42 am
Forum: Evolution
Topic: Evolution of the Face and Head
Replies: 5
Views: 5222
View all matching forum results

This page was last modified 00:10, 1 May 2007. This page has been accessed 6,690 times. 
What links here | Related changes | Permanent link