/ro stel"euhm/ , n. , pl. rostella /ro stel"euh/ .
1. Biol. any small, beaklike process.
2. Bot. a beaklike modification of the stigma in many orchids.
3. Zool.
a. a projecting part of the scolex in certain tapeworms.
b. a part of the mouth in many insects, designed for sucking.
[ 1750-60; rostrum snout (see ROSTRUM); for formation, see CASTELLUM ]