Word of the Day:

: any of an order of night-flying mammals with forelimbs modified to form wings : bat

The vampire hunters were greeted by swarms of chiropterans as they entered Dracula's castle.

"Chiroptera" is the name of the order of the only mammal capable of true flight, the bat. The name is influenced by the hand-like wings of bats, which are formed from four elongated "fingers" covered by a cutaneous membrane. It is based on the Greek words for "hand," "cheir," and "wing," "pteron." "Cheir" also had a hand in the formation of the word "surgery," which is ultimately derived from the ancient word "cheirourgos," meaning "doing by hand." "Pteron" is widely used in technical names of flying insects. It’s also the ancestor of a well-known, common word: "helicopter," which joins “pteron” with Greek "heliko," meaning "spiral.”