Wearing boots or having boots on; equipped with boots.
From 'boot' (from Old French 'bote') plus the suffix '-id' or '-ed' used to form adjectives meaning 'having' or 'wearing'.
The '-id' suffix is unusual in English—it's more common to say 'booted,' but 'bootid' shows how language experimments with different word-endings to describe the same concept, and some variations stick while others disappear.
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