| bacteria |
microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. |
| bitter |
having a strong taste that is neither sweet nor sour. |
| courtesy |
good, polite manners. |
| fin |
a thin, flat body part of a fish and certain other water animals which is used for swimming or balance. |
| freeze |
to make into ice or become solid from cold temperatures. |
| harden |
to make less soft or more rigid. |
| housework |
the work of taking care of a household, especially cleaning inside the house. |
| knee |
the joint between the upper and lower part of the leg. |
| large |
big in size or amount. |
| nut |
a large seed that people or animals can eat that grows in a hard shell. |
| operator |
a person whose job is to control a machine. |
| slide |
to move easily along a smooth surface. |
| sour |
having a sharp taste caused by acid. Lemons, vinegar, and yogurt are some things that are sour. |
| stair |
(plural) a flight of steps one walks up or down. |
| wobble |
to move or tip from side to side in an unsteady way; be out of balance. |