Down along the first base line came a sizzling grounder just inside the base.
In setting the third row of stakes, use the second as a base line, and so on.
The distance between the eyes forms a base line for optical triangulation.
He rolls the ball from the base line into one of the holes or caps.
A base line permanently fixed on the ship is the one side of a triangle required.
The base line was completed on the 19th, and measured six miles.
The game continues until the last player on each team, after carrying the egg forward, returns across the base line.
The third bunted down the third base line and was also safe.
The ball rolled slowly down the third base line until Brown pounced on it.
Its position could not be determined until a base line had been established.
1818, from Medieval Latin triangulationem (mid-12c., nominative triangulatio), noun of action from Latin *triangulare, from triangulum (see triangle).
"bottom, foundation, pedestal," early 14c., from Old French bas "depth" (12c.), from Latin basis "foundation," from Greek basis "step, pedestal," from bainein "to step" (see come). The military sense is from 1860. The chemical sense (1810) was introduced in French 1754 by French chemist Guillaume-François Rouelle (1703-1770). Sporting sense of "starting point" ia from 1690s, also "destination of a runner" (1812). As a "safe" spot in a tag-like game, suggested from mid-15c. (as the name of the game later called prisoner's base).
late 14c., "low, of little height," from Old French bas "low, lowly, mean," from Late Latin bassus "thick, stumpy, low" (used only as a cognomen in classical Latin, humilis being there the usual word for "low in stature or position"), possibly from Oscan, or Celtic, or related to Greek basson, comparative of bathys "deep." Figurative sense of "low in the moral scale" is first attested 1530s in English, earlier "servile" (1520s). Base metals (c.1600) were worthless in contrast to noble or precious metals.
"to place on a foundation," 1841, from base (n.). Related: Based; basing.
base line n.
A line corresponding to the base of the skull, passing from the infraorbital ridge to the midline of the occiput, through the ear canal.
A line serving as a basis, as for measurement or calculation.
The part of an organ nearest its point of attachment.
A fundamental ingredient; a chief constituent of a mixture.
Any of a large class of compounds, including the hydroxides and oxides of metals, having a bitter taste, a slippery solution, the capacity to turn litmus blue, and to react with acids to form salts.
A molecular or ionic substance capable of combining with a proton to form a new substance. Also called Brønsted base.
A nitrogen-containing organic compound that combines in such a manner.
A substance that provides a pair of electrons for a covalent bond with an acid.
A method of determining the relative positions of points in space by measuring the distances, and sometimes angles, between those points and other reference points whose positions are known. Triangulation often involves the use of trigonometry. It is commonly used in the navigation of aircraft and boats, and is the method used in the Global Positioning System , in which the reference points are satellites.
Any of a number of bitter-tasting, caustic materials. Technically, a material that produces negative ions in solution. A base is the opposite of an acid and has a pH of 7 to 14. A given amount of a base added to the same amount of an acid neutralizes the acid; water and a salt are produced. Alkalis are bases; ammonia is a common base.