brainlet

noun brainlets

1. A subcomponent of a brain or thinking system. Let's call these five smaller brain units, brainlets: […] Each brainlet is found in a specific part of your thinking brain.
2. obsolete The cerebellum.
3. informal A small brain; the brain of someone or something small or of someone who is not very intelligent. ...viz. the railway : an invention which is so thoroughly English that, even supposing it likely to have occurred to any slow Prussian brainlet, it would still have been impossible to have found any other nation (excepting perhaps America) with spirit or capital sufficient to have afforded the plan
4. broadly A dolt; a fool; someone having a small brain. Still, we have in this country Whig writers—that is, party Whig writers, of the regular party guage, assuring the other little brainlets who believe their writings, that Ruskin is an author of equivalent genius to Jeremy Taylor's—a great man—an intellectual pinnacle—merely because he puts his hand t