from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A half of a circle as divided by a diameter.
- noun An object or arrangement of objects or people in the shape of half a circle.
from The Century Dictionary.
- noun In meteorology, one half of the area covered by a cyclonic storm. In the northern hemisphere the dangerous semicircle for navigation is that on the right-hand side as one advances along the path of the center of a progressive storm: the manageable, or navigable, or safer semicircle is that on the left-hand side.
- noun The half of a circle; the part of a circle comprehended between a diameter and the half of a circumference; also, the half of the circumference itself.
- noun Any body or arrangement of objects in the form of a half-circle.
- noun An instrument for measuring angles; a species of theodolite with only half a graduated circle; a graphometer.
from the GNU version of the Collaborative International Dictionary of English.
- noun The half of a circle; the part of a circle bounded by its diameter and half of its circumference.
- noun A semicircumference.
- noun A body in the form of half of a circle, or half of a circumference.
- noun An instrument for measuring angles.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
Halfof a circle.
- noun An
instrumentfor measuring angles.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a plane figure with the shape of half a circle
from Wiktionary, Creative Commons Attribution/Share-Alike License
According to the theorem, any triangle inscribed in a semicircle is a right triangle, as is shown in the following diagram:
The Medieval Problem of Universals Klima, Gyula 2008
The mind would then only tend to the affirmation of the sole motion of a semicircle, which is not contained in the conception of a semicircle, and does not arise from the conception of any cause capable of producing such motion.
The first figure is a semicircle, which is perpendicular to the plane of the circle ABDZ and which starts on the diameter AED and, with point A remaining fixed, rotates to position AKD.
Archytas Huffman, Carl 2007
Therefore it is the assumption of B, the half of two right angles, from which it follows that A is attributable to C, i.e. that the angle in a semicircle is a right angle.
Posterior Analytics Aristotle 2002
The half of a circle is termed a semicircle; thus, in Figure 52, A B and
Mechanical Drawing Self-Taught Joshua Rose
The vaulting, windows, and doorways had the form of the round arch, that is, a semicircle, as in the ancient Roman monuments.
Early European History Hutton Webster
I have counted wrong; and of those not three are of other material than stone, nor are there as many others that fail to cause expense to your Majesty and labor to the natives -- and this in one legua about the city as I have said, in a semicircle, which is even not entire, for the other half falls within this bay.
The Philippine Islands, 1493-1898 — Volume 19 of 55 1620-1621 Explorations by early navigators, descriptions of the islands and their peoples, their history and records of the catholic missions, as related in contemporaneous books and manuscripts, showing the political, economic, commercial and religious conditions of those islands from their earliest relations with European nations to the close of the nineteenth century. James Alexander Robertson 1906
In the centre of the semicircle was a great round hole, 30 ft. in diameter -- an extinct crater.
Across Unknown South America Arnold Henry Savage Landor 1894
We had delicious young chicken -- quite babies they were, poor dears -- fried with cream; and wreathed all round our plates in a semicircle were a quantity of tiny dishes.
Lady Betty Across the Water Orson Lowell 1889
Within the semicircle were a number of Arabs of high and low degree, a few of them well-dressed and armed to the teeth, others dirty and shabby; but all intent on business.
The Three Commanders William Henry Giles Kingston 1847