A sea slug of the former suborder Notaspidea, now split into clades Umbraculida and Pleurobranchomorpha.

A check in growth. / That which has been checked in growth; a stunted animal or thing. / A two-year-old whale, which, having been weaned, is lean and yields little blubber.

The puncturing of the heel of a neonatal baby in order to withdraw a blood sample

(informal, Scotland) noddle (head)