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protonema
protonics
protonotary
protoplanet
protoplasm
protoplast
protoporphyrin
protostar
protostome
prototherian
prototrophic
prototype
protoxide
protozoan
protozoology
protozoon
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protostome
pro·to·stome [ prṓtə stm ] (plural pro·to·stomes)


noun 
Definition:
 
invertebrate animal: an invertebrate animal, e.g. a mollusk or arthropod, in which the mouth forms directly from the blastopore
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