bolthead (plural boltheads)
(chemistry) A round-bottomed flask with a long neck (used especially for distillation)
The head of a bolt.
• Theobald, head bolt, head-bolt, headbolt
Source: Wiktionary
Bolt"head` (, n.
1. (Chem.)
Definition: A long, straightnecked, glass vessel for chemical distillations; -- called also a matrass or receiver.
2. The head of a bolt.
Source: Webster’s Unabridged Dictionary 1913 Edition
14 March 2025
(noun) the relation between two different kinds of organisms in which one receives benefits from the other by causing damage to it (usually not fatal damage)
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