Hypertext Webster Gateway: "Sympiesometer"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Sympiesometer \Sym`pi*e*som"e*ter\, n. [Gr. ? compression (fr. ?
to press together; sy`n with + ? to press, squeeze) +
-meter.]
A sensitive kind of barometer, in which the pressure of the
atmosphere, acting upon a liquid, as oil, in the lower
portion of the instrument, compresses an elastic gas in the
upper part.
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