tubal
Etymology
From tube + -al.
adj
-
Of or pertaining to a tube, especially an anatomical one. The tubal heating surface of the Raven design was considerably less than on the contemporary Gresley design, and the grate area was the same, although the firebox heating surface was less. 1949 May and June, R. A. H. Weight, “A Short-Lived Pacific Class”, in Railway Magazine, page 195
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