astro'physicist

World English Dictionary
astrophysics (ˌæstrəʊˈfɪzɪks) [Click for IPA pronunciation guide]
 
n
(functioning as singular) the branch of physics concerned with the physical and chemical properties, origin, and evolution of the celestial bodies
 
astro'physical
 
adj
 
astro'physicist
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Astro'physicist is always a great word to know.
So is doohickey. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
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