free from or cleaned of germs and other microorganisms.

A protein made by plasma cells (a type of white blood cell) in response to an antigen (a substance that causes the body to make a specific immune response).

a deep-seated feeling of dislike; aversion.

an underground electric railroad

the soil lying immediately under the surface soil.

a person or thing acting or serving in place of another.

a self-contained system within a larger system.

to laugh at someone or something in a silly and often unkind way

a state of confused and noisy disturbance

make or become less sharp

not recorded or plotted on a map, chart, or plan

devotion or loyalty to a person, group, or cause

give a creased, ruffled, or disheveled appearance to.

with great effort, attention, or concentration