tercentenary (iou) and suffocating gas (medicine)

tercentenary (iou)

tercentenary adjective & noun. M19.
[from TER- + CENTENARY.]
A. adjective. Of or pertaining to a period of three hundred years or a tercentenary; tercentennial. M19.
b. noun. A duration of three hundred years; esp. (a celebration of) a three-hundredth anniversary. M19.

suffocating gas (medicine)

suffocating gas

A gas, such as chlorine or phosgene, that causes intense irritation of the bronchial tubes and lungs, resulting in pulmonary oedema.

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