NA2 4/12/17

p.34

bio- /baɪəʊ, baɪə $ baɪoʊ, baɪə/ prefix

relating to or using living things

 bio-genetics

 biophysics

nano- /nænəʊ $ -oʊ/ prefix [in nouns] 

one billionth part of a unit

 nanometre (=a billionth of a metre)

x to the second power

y to the third power

y to the nth power

semi- /semi/ prefix 

1 exactly half

 a semicircle

2 partly but not completely

 in the semi-darkness

 semi-literate people

3 happening, appearing etc twice in a particular period

 a semi-weekly visit

 a semi-annual publication

ultra- /ʌltrə/ prefix  1 extremely an ultra-modern building He remained ultra-cautious. an ultra-light jacket

bi‧o‧tech‧nol‧o‧gy /ˌbaɪəʊtekˈnɒlədʒi $ ˌbaɪoʊtekˈnɑː-/ ●○○ (also biotech /ˈbaɪəʊtek $ ˈbaɪoʊ-/ informal) noun [uncountable] 

the use of living things such as cells, bacteria etc to make drugs, destroy waste matter etc

 the biotech industries

bi‧o‧chem‧is‧try /ˌbaɪəʊˈkeməstri $ ˌbaɪoʊ-/ noun [uncountable] 

the scientific study of the chemistry of living things

nanobots

nanoparticles

megastructuctures

meg‧a‧bit /ˈmeɡəbɪt/ noun [countable] 

technical a million bits

megabyte

microchip

microparticle

microscope

semidetached

sem‧i‧cir‧cle /ˈsemiˌsɜːkəl $ -ɜːr-/ noun [countable] 

half a circle

in a semicircle

 About 50 children sat in a semicircle around me.

Ultraviolet

Ultrasounds

U.N., UN /ˌjuː ˈen/ noun 

→ the UN

complete/utter/absolute etc chaos There was total chaos on the roads.