Webster's Dictionary 
(1): ( v. t.) To mark or designate with an obelisk.
(2): ( n.) An upright, four-sided pillar, gradually tapering as it rises, and terminating in a pyramid called pyramidion. It is ordinarily monolithic. Egyptian obelisks are commonly covered with hieroglyphic writing from top to bottom.
(3): ( n.) A mark of reference; - called also dagger [/]. See Dagger, n., 2.
Holman Bible Dictionary 
Hastings' Dictionary of the Bible 
Obelisk . See Pillar, 2 ( c ).
International Standard Bible Encyclopedia 
ob´ḗ - lisk , ob´el - isk : A sacred stone or maccēbhāh . For maccēbhāh the Revised Version (British and American) has used "pillar" in the text, with "obelisk" in the margin in many instances ( Exodus 23:24; Leviticus 26:1; Deuteronomy 12:3; 1 Kings 14:23; Hosea 3:4; Hosea 10:1 , Hosea 10:2 , etc.), but not consistently (e.g. Genesis 28:18 ). See Pillar .
The Nuttall Encyclopedia 
A tall four-sided pillar, generally monolithic, tapering to a pyramidal pointed top, erected in connection with temples in Egypt, and inscribed all over with hieroglyphs, and in memorial, as is likely, of some historical personage or event; they are of ancient date.