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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Creating recursive customization types / widgets
Date: Tue, 02 Dec 2003 23:46:12 -0500
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    'lazy' and 'delayed' are good because they describe how the widget
    accomplish its task.  But I now believe 'recursive' is best, because
    it described what the task is.  Also 

      (define-widget 'binary-tree 'recursive ...)

    reads well:  A binary tree is a recursive datastructure with the
    following attributes ...

That use is recursive, but the widget doesn't require you to use
recursion.  Its essence is lazy or delayed evaluation.  So I think
that should be the name.