Breadcrumb Home > Dictionary > Index K Klinefelter's syndrome: Meaning and Definition of Find definitions for: Kline'fel•ter's syn"drome Pronunciation: (klīn'fel-turz), [key] — Pathol. Pathol. an abnormal condition in which at least one extra X chromosome is present in a male: characterized by reduced or absent sperm production, small testicles, and in some cases enlarged breasts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. K-line Kline test TrendingHere are the facts and trivia that people are buzzing about. Animal Group Terminology Largest Countries in the World (by Area) Current Events This Week: January 2023 State Abbreviations Dinosaur Fossils (By U.S. State!) The Chinese Zodiac ✖ Related Content Daily Word Quiz: catalpa Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language