(biochemistry, followed by a Roman numeral) A synonym for any of several hemes (followed by a letter)

Of or relating to a tetrad. / (of a shape) Having four-fold symmetry; used especially of the digits 0, 1 and 8.

The use of a stoneblower to level the sleepers of a railway track.

(historical) Of or relating to the island of Celebes, or Sulawesi.