a synclinal trough or valley; a synclinal fold

If the muscles of cold-blooded animals are heated to a temperature of 40° C, the warmth-rigidity (Wärmestarre), a condition very similar to death-stiffness, is superinduced. The cause of the death-stiffness and warmth-stiffness, is in the fact that certain fluid ingredients …

We had to ease the entry requirements.

His precise meaning was not easy to come at.