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protostome
prototherian
prototrophic
prototype
protoxide
protozoan
protozoology
protozoon
protract
protracted
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protonema

pro·to·ne·ma [ prtə nmə ] (plural pro·to·ne·ma·ta [ prtə nmətə ])


noun 
Definition:
 
thread-shaped structure of moss: the primary thread-shaped structure of mosses and some liverworts that results from the germination of a spore and gives rise to a new plant

[Mid-19th century. <proto- + Greek nēma "thread"]

pro·to·ne·mal adjective
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