15-letter words containing o, p, e, d, a
- top dead center — Top dead center is the position of an engine's piston when it is at the very top of its stroke.
- top dead-centre — the position of the crank of a reciprocating engine or pump when the piston is at the top of its stroke
- total depravity — the Calvinist doctrine that humankind's entire nature, including its reason, is corrupt or sinful as a result of the Fall and that people are therefore completely dependent on God for regeneration.
- transportedness — the quality or state of being carried away with pleasure or rapture
- trapdoor spider — any of various, often large, spiders (esp. family Ctenizidae) that dig a burrow and cover the entrance with a hinged lid like a trapdoor
- una corda pedal — soft pedal (def 1).
- unchoreographed — not choreographed; not pre-arranged or pre-prepared; unplanned
- undercompensate — to compensate or pay less than is fair, customary, or expected.
- underpopulation — having a population lower than is normal or desirable.
- unleaded petrol — petrol containing a reduced amount of tetraethyl lead
- unsophisticated — not sophisticated; simple; artless.
- upwardly mobile — See under vertical mobility (def 1).
- wind-pollinated — being pollinated by airborne pollen.
- wraparound care — a childcare facility intended to help working parents, in which young children are looked after before and after school
- xeroradiography — an x-ray utilizing a specially coated plate that allows a picture to be developed without the use of liquid chemicals.