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Letter Term Description Category
R Ripening of Cervix

When the cervix softens to prepare for labor.

Pregnancy
R Risk

A situation where there may be some danger.

Environmental Science
R Red Blood Cell

The most common type of blood cell, used to deliver oxygen to the body tissues.

Biology
R Restriction Enzymes

Enzymes that cuts DNA molecules at specific sequences. Also referred to as Restriction endonucleases.

Molecular Biology
R Red Blood Cell (Fingerspelling)

The most common type of blood cell, used to deliver oxygen to the body tissues.

Biology
R Refugee

A person who has been forced to leave their country in order to escape war, persecution or natural disaster

Environmental Science
R Retina

The retina is the innermost, light-sensitive layer of tissue of the eye.

Biology
S Soon

In short time.

Mathematics
S Storm

A violent disturbance of the atmosphere with strong winds and usually rain, thunder, lightning, or snow.

Environmental Science
S Secretion - Lungs

Mucus secretion is the first-line defense against pathogens and irritants we breathe into our lungs.

Biology