from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A depression in which water collects, especially one where wild animals come to drink.
- n. A part of the electromagnetic spectrum, between the regions where hydrogen and hydroxyl radiate, that is relatively quiet in terms of radio astronomy.
from The Century Dictionary and Cyclopedia
- In coffee-cultivation. See the quotation.
From water + hole (Wiktionary)