Relating to or located outside the region of an umbrella-like shadow; beyond the range of a protecting shadow.
From Latin 'ab-' (away from) + 'umbrella' (a small shade) + '-ar' (adjective suffix); an extremely rare technical term combining Latin and the borrowed word 'umbrella.'
This word shows how scientific terminology can become almost absurdly specific—it was likely coined to describe precise astronomical or botanical phenomena where researchers needed exact language for publication.
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