(chemistry) Water containing tritium instead of normal hydrogen (symbol T₂O).

(idiomatic) To overcomplicate things, to make things appear worse than they are.

(idiomatic) to make heavy weather of

(idiomatic, rare) drunk

A prolonged event believed to have occurred around the Hadean-Archean boundary, during which an unusually high number of asteroids hit the terrestrial planets and their moons.

(idiomatic, rare) Very heavy.

plural of heavy-duty vehicle

improper fraction

plural of top-heavy fraction

(idiomatic) To make progress only with difficulty.