From whirl + -in? whirlin (uncountable) (biochemistry) A protein encoded in humans by the gene DFNB31, possibly involved in the formation of scaffolding...
wonder how fast this feller is? Ever heard?" "They seem to think he's a whirlin' ball of fire, but that don't worry you none, does it?" 1981, Jim Brosnan...
Tailor, page 378: Tibbie an' Andro bein' at that moment in the act o' whirlin' roond us were sooked into the vortex an' upset likewise, so that here...