Having many small pores or openings; characterized by a porous structure without obvious larger passages.
From Greek 'aporos' (porous, impassable), with the feminine Latin ending '-osa.' First used in botanical descriptions during the 18th century to describe plant tissues and surface features.
This word reveals how botanists needed specific terms to describe microscopic structures—'aporosa' describes tissues so densely porous they look almost impenetrable, which is why the word literally means 'impassable pores.'
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