Did you maybe mean one of these? chocolate, chordate, chromate
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Examples
“The chorobate was a ten-foot long wooden trough with a groove running down its middle.”
“The ancient Romans did pretty well using just three simple instruments: the groma, the chorobate, and measuring rods.”
“Water was poured into the groove; if it pooled instead of running out either end, then whatever the chorobate was placed on was level.”
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vanishedone Der Spiegel: 'The Romans did have levels, a six-meter long design called a chorobate copied from the Persians. They also filled goat intestines with water to find a level around corners. But that alone does not explain the precision of this amazing aqueduct.' Mar 24, 2009