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From Biology-Online Dictionary | Biology-Online Dictionary
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1. A clear space between a citadel and the nearest houses of the town. The glacis of the counterscarp, or the slope of the parapet of the covered way toward the country.

2. (Science: botany) a grass plat; a lawn.

3. Any clear, level space used for public walks or drives; especially, a terrace by the seaside.

Origin: f. Esplanade, sp. Esplanada, explanada, cf. It. Spianata; fr. Sp. Explanar to level, L. Explanare to flatten or spread out. See explain.