| Word form | waku |
| Original script | 沸く |
| LWT meaning(s) | |
| Word meaning | Original meaning “melt”, present meaning in 984. |
| Analyzability | unanalyzable |
| Age | Late Old Japanese [21] (794–1185) |
| Lexical stratum | wago |
| Year | 850 |
| Comparison with Korean | Class 3: (in K, only an imperfect adnominal form is attested): K pakï l/pëkïl < * bak- |
| Register | General |