flatworm. see Platyhelminthes Platyhelminthes, phylum containing about 20,000 species of soft-bodied, bilaterally symmetrical, invertebrate animals, commonly called flatworms.There are four classes: the free-living, primarily aquatic class, Turbellaria, and Trematoda, Cestoda, and Monogenea, which are.....ee Platyhelminthes Platyhelminthes, phylum containing about 20,000 species of soft-bodied, bilaterally symmetrical, invertebrate animals, commonly called flatworms.
Freebase(0.00 / 0 votes)Rate this definition: Pro rata. Pro rata is an adverb or adjective, meaning in proportion. The term is used in many legal and economic contexts. It is sometimes spelled pro-rata, but this is technically a misspelling of the Latin phrase. In North American English this term has been vernacularized to prorated.
Report Abuse. pro rata means accordingly calculated in latin. Per annum means per year in latin. It means that if the pay was Â£25,000 a year for a full time person you'd get it calculated for the part time position but it's easier to understand how much the salary is if it is written like this.t means the figure shown as a wage in a job ad won't be what you'll be paid. EG - Â£30k per annum (pro rata) for a job advertised as 17.5 hours per week would probably pay around Â£15k-the Â£30k refers to the full time pay.