| 释义 |
bolt-head, bolt's-head
Also 7 boult head, boulthed.
[f. bolt n.1]
1. The head (a) of a bolt, or arrow; (b) of a bolt for holding parts together.
c1475Voc. in Wr.-Wülcker 812 Hec cuspis, a bolthed. 1483Cath. Angl. 36 A Bolte hede, capitellum. 1691T. H[ale] Acc. New Invent. 20 The Bolt-heads, etc., being fairly parcelled.
2. Chem. A globular flask with a long cylindrical neck, used in distillation.
1610B. Jonson Alch. ii. ii, Blushes the bolts-head? Ibid. iv. iv, This doctor..Will close you so much gold in a bolt's-head. 1667Boyle Orig. Formes & Qual., Having plac'd the mixture in a Bolt-head or Glass-egg with a long neck. 1763Brit. Mag. IV. 63 Put it into a large bolt-head, with a long neck. 1820Scott Abbot xxvi, Crucibles, bolt-heads, stoves, and the other furniture of a chemical laboratory. 1877Griffin Chem. Handicr. 146.
†3. A dragon-fly. Obs.
1668Wilkins Real Char. ii. v. §2. 126 Naked winged Insects. 7 Dragon Fly, Bolts head. |