monoprogeny
n.— «Three of my closest friends are also only children and, now in our mid-30s, we have been supporting and feuding with each other in a proto-sibling way since meeting at university. We realised this a few years ago, when a boyfriend commented on the tendency of monoprogeny—his disapproving coinage—to huddle together.» —“Plays well with others?” by Miranda Green Financial Times (United Kingdom) May 4, 2007. (source: Double-Tongued Dictionary)
Further reading
Do you refer to your dog or cat as “somebody”? As in: When you love somebody that much, you don’t mind if they slobber. In other words, is your pet a somebody or a something? Also, for centuries, there was little consistency in the...
It was a dark and stormy night. So begins the long and increasingly convoluted prose of Edwards Bulwer-Lytton’s best-known novel. Today the annual Bulwer-Lytton Contest asks contestants for fanciful first sentences that are similarly...