bastille

The noun is derived from Middle English bastile, bastel (“fortification for attack mounted on a barge or wheels; projecting part of a fortification, bastion, turret; fortified encampment of a besieging army; structure carrying armed men on an elephant’s back; (figuratively) refuge, shelter; protector”) [and other forms], from Anglo-Norman bastile, bastille, Middle French bastille, and Old French baastel, basstel (“fortification; fortified tower; temporary fortification constructed for attack or defence; (small) castle or fortress”) (modern French bastille; compare Medieval Latin bastīle), from bastide (“fortification; fortress”) with the ending modified after nouns ending in -ille (from Latin -īle (suffix forming place names)). Bastide is derived from Old Occitan bastida (“fortification; (Provence) country mansion”), from bastir (“to build, construct”) + -ida (suffix forming nouns); while bastir is from *bastīre, from Frankish *bastijan (“to sew; to weave”), from Proto-West Germanic *bast (“fibre; rope”); further etymology uncertain, perhaps from Proto-Indo-European *bʰask- ~ *bʰasḱ- (“bundle, heap, load”) but this is disputed.

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