Wiktionary
n. A tool used to cut the end off of a cigar so that it may be smoked.
WordNet
n. an implement for cutting the tip off of a cigar
Wikipedia
A cigar cutter is a mechanical device designed to cut one end off a cigar so that it may be properly smoked. Although some cigars are cut on both ends, or twirled at both ends, the vast majority come with one straight cut end and one end in a "cap" which must be cut off for the cigar to be smoked. Most quality handmade cigars, regardless of shape, will have a cap which is one or more small pieces of a wrapper pasted onto one end of the cigar with either a natural tobacco paste or with a mixture of flour and water. The cap end of a cigar is the rounded end without the tobacco exposed, and this is the end one should always cut. The cap may be cut with a knife or bitten off, but if the cap is cut jaggedly or without care, the end of the cigar will not burn evenly and smokeable tobacco will be lost.
Usage examples of "cigar cutter".
Montfort d'M------, likewise the cigar cutter, and the last of the cigars I had purchased that day.
From a still smaller pocket I took out my cigar cutter and matches.
A glazed black lacquer ashtray was pushedto the side, a brass cigar cutter in its center.
Then he clipped the end with a cigar cutter from his vest pocket, stuck the clipped cheroot between his lips and rolled it over and over until the outer leaves of the lip-end were agreeably wet.