- redia:
- an intramolluscan stage of digeneans, possessing a gut.
- relapsing fever:
- a bacterial disease characterized by repeated periods of fever and moderate
mortality.
- reticulocyte:
- young erythrocytes that have recently lost their nucleus.
- retroinfection:
- a type of autoinfection whereby larval parasites just passed in the host's
feces re-enter the anus and establish a new infection.
- rhabditiform:
- possessing an esophagus with a narrow central region and a terminal bulb.
- ring stage:
- the young trophozoite of Plasmodium spp., so named because a large central
vacuole and peripheral nucleus give it the appearance of a signet ring.
- Rocky Mountain spotted
fever:
- a rickettsial disease transmitted by ticks and characterized by an
extensive rash.
- rosette:
- a posterior series of flaps, resembling the petals of a carnation, used as
an organ of attachment by Gyrocotyle.
- rostellum:
- a central protrusion, eversible or not, on the scolex of some Cestoda.