a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
division into two parts or classifications, esp when they are sharply distinguished or opposed: the dichotomy between eastern and western cultures
2.
logic the division of a class into two mutually exclusive subclasses: the dichotomy of married and single people
3.
botany a simple method of branching by repeated division into two equal parts
4.
the phase of the moon, Venus, or Mercury when half of the disc is visible
[C17: from Greek dichotomia; see dicho-, -tomy]
usage Dichotomy should always refer to a division of some kind into two groups. It is sometimes used to refer to a puzzling situation which seems to involve a contradiction, but this use is generally thought to be incorrect