subtriple en · ADJ
Etymology
From sub- + triple.
Meanings
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(not-comparable, obsolete) Containing a third, or one part to three.
[…] then the power at A, will be in a subtriple proportion to the weight E, because the heaviness would be then equally divided unto the three points of the lower diameter B, C, D, each of them supporting a like share of the burthen.
1641, John Wilkins, Mercury, or the Secret and Swift Messenger: