| decahedron |
in geometry, a ten-faced solid figure. |
| hard hat |
a protective helmet, made of metal or hard, impact-resistant plastic, worn by construction workers, miners, and the like. |
| hard wheat |
wheat that has hard kernels containing a high amount of protein, used to make semolina and pasta; durum. (Cf. soft wheat.) |
| hard-hat |
(informal) a construction worker. |
| hardheaded |
not easily moved, manipulated, or duped; shrewd; pragmatic. [2 definitions] |
| head-to-head |
in direct, often individual confrontation or opposition. |
| headrest |
a rest or support for the head, as on a chair or a seat in a motor vehicle. |
| heart rate |
the number of times the heart beats in one minute, esp. as a measure of how hard the heart is working during physical exercise or emotional stress; pulse. |
| heart-to-heart |
freely expressing feelings; open; frank. |
| heartrending |
causing or expressing deep sorrow or anguish. |
| hereditary |
of or pertaining to traits or tendencies that can be genetically transmitted from parent to offspring. [3 definitions] |
| hetaera |
in ancient Greek society, a female paramour or concubine, often a member of a class of educated slaves or cultured companions. [2 definitions] |
| hydrometer |
an instrument, usu. a sealed glass tube containing a graduated scale and weighted at one end, used to measure the specific gravity of liquids. |
| literature |
writings such as dramas, poems, novels, essays, and stories, esp. those that have lasting artistic value. [3 definitions] |
| tetrahedral |
of or shaped like a tetrahedron. |
| tetrahedron |
a solid figure formed by four triangular faces; triangular pyramid. |
| trattoria |
an inexpensive café or restaurant that serves Italian dishes. |
| trihedral |
having three planes that meet in a point. [2 definitions] |