noun
common bean; green bean
Refers to the common bean (Phaseolus vulgaris), especially the immature pod eaten as a vegetable. The name comes from the fact that it can be harvested three times a year.
See also: いんげん豆
三度豆は、さっと茹でて和え物にすると美味しい。
Common beans are delicious when quickly boiled and dressed.
この時期、畑の三度
At this time of year, the common beans in the field are growing well.
noun
snow pea; mangetout
Dialectal use in Fukushima and Niigata for snow peas (Pisum sativum var. saccharatum). Not standard Japanese; in most regions さやえんどう is used.
See also: さやえんどう
福島では、三度豆と言えばさやえんどうを指すことがある。
In Fukushima, 三度豆 can refer to snow peas.
さやえんどう is the standard Japanese word for snow pea/mangetout; 三度豆 is a dialectal synonym in Fukushima and Niigata.
From 三度 (three times) + 豆 (bean), referring to the plant's ability to be harvested three times per year. The dialectal sense for snow pea likely arose from a similar appearance or usage.