1.
wild yam; Japanese wild yam
A wild yam (Dioscorea japonica) native to Japan that grows naturally in mountain forests. Prized for its intensely sticky texture and rich flavor when grated, it is considered a delicacy and is significantly more expensive than cultivated varieties.
自然薯を掘り当てた。
I dug up a wild yam.
自然薯のとろろは粘りが強い。
Grated wild yam has a very strong, sticky consistency.
この地域は自然薯の産地として知られている。
This region is known as a production area for wild yams.
The name literally means 'natural yam' (自然 + 薯), though the reading じねんじょ preserves an older pronunciation of 自然. Digging wild 自然薯 from mountain soil is a traditional autumn activity, as the roots grow deep and are difficult to extract without breaking.
USAGE:
- 自然薯 commands a premium price — wild-harvested specimens can sell for several thousand yen per kilogram.
- Cultivated 自然薯 is now available, grown in tubes or pipes to guide root growth, but wild specimens remain the most valued.
- The grated とろろ from 自然薯 is noticeably stickier and more flavorful than that from 長芋.
COMMON COLLOCATIONS:
- 自然薯を掘る: to dig up wild yam
- 自然薯のとろろ: grated wild yam
- 自然薯料理: wild yam dishes
- 自然薯そば: soba noodles with wild yam
SIMILAR WORDS:
- 長芋: Chinese yam — the most common cultivated yam in Japanese supermarkets; less sticky and milder in flavor
- 山芋: mountain yam — general term for Japanese yams; sometimes used loosely as a synonym for 自然薯
- 大和芋: Yamato yam — a cultivated variety with a flat shape; stickier than 長芋 but less so than 自然薯