| Webster's Online Dictionary |
| Part of Speech | Definition | |
| Expression | 1. A valve to drain the portion of a pipe, hydrant, pump, etc., where water would be liable to freeze.[Websters]. | |
| Top | ||
| Expressions | Definition | ||
| Frost valve | A valve to drain the portion of a pipe, hydrant, pump, etc., where water would be liable to freeze. Source: Webster's Revised Unabridged Dictionary. | ||
Source: compiled by the editor from various references; see credits. | Top | ||