the Irish name for wing collar
butterfly common lisp
a damper, as in a flue, that rotates about a central axis across its face.
noun (astronomy) a graphical butterfly-shaped representation of the sunspot density on the solar disc in the 11-year sunspot cycle
a cumulatively large effect that a very small natural force may produce over a period of time. noun the idea, used in chaos theory, that a very small difference in the initial state of a physical system can make a significant difference to the state at some later time noun Word Origin