Concise Oxford Dictionary of Archaeology (755 page)

BOOK: Concise Oxford Dictionary of Archaeology
9.43Mb size Format: txt, pdf, ePub
ultima ratio regis
[Ge].
‘The king's final argument’, an inscription commonly found on Spanish royal cannon.
ultra-violet visible spectrophotometry
(uv-vis)
[Te].
A method for determining the chemical composition of materials. Based on the same principle as
AAS
, a beam of light is passed through a sample such that the amount of light absorbed is proportional to the concentration of the chemical under investigation. It can be used either to scan through a range of wavelengths from the ultra-violet to the visible or to analyse at one wavelength. Typical applications include the analysis of phosphates in soil extracts (where the phosphate is made to form a blue-coloured complex which absorbs in the visible region), the determination of iron and aluminium levels in soil, or the chemical composition of ancient glass.
Umayyads
[CP].
First dynasty of Arab leaders, the descendants of a Meccan merchant who submitted to Muhammad . They seized power in ad 661 and maintained a system based on that of the nomadic desert tribes until split by internal feuds and the rise of the Persian
ABBASIDS
in ad 750.
umu ti
[Co].
Kind of earth oven found in the South Island of New Zealand.
unchambered long barrow
[MC].
undercroft
[Co].
A vaulted subterranean room or basement usually wholly or partly under a larger building. Commonly used in medieval times as secure storage for goods and commodities by traders and merchants.
understanding
[Th].

Other books

Night of a Thousand Stars by Deanna Raybourn
Concherías by Aquileo Echeverría
Yellowstone Standoff by Scott Graham
Little Mercies by Heather Gudenkauf
Nicolai's Daughters by Stella Leventoyannis Harvey
Fallen Angel by Heather Terrell
Finale by Becca Fitzpatrick
Angel Blackwood by Sophie Summers