obstantia
From LSJ
πέτρην κοιλαίνει ρανὶς ὕδατος ἐνδελεχείῃ → constant dropping wears away a stone, constant dripping will wear away the hardest stone, little strokes fell big oaks, constant dripping wears the stone, constant dropping wears the stone, constant dripping will wear away a stone
Latin > English (Lewis & Short)
obstantĭa: ae, f. obsto,
I a standing before or against, a resistance, hinderance, obstruction (only in Vitr.): terrae, Vitr. 9, 5, 4: aëris, id. 6, 1: umbrarum, id. 8, 1.
obstantĭa: ĭum, n., v. obsto
I fin. c.