| top dead-centre | |
| —n | |
| engineering t.d.c. the position of the crank of a reciprocating engine or pump when the piston is at the top of its stroke | |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
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