colourimetric test (medicine) and clue 1, noun (oh)

colourimetric test (medicine)

colourimetric test
<investigation> A test that depends on a colour change to demonstrate the presence (or absence) of a particular compound or chemical.

Examples include Home urine Pregnancy testing, finger stick blood glucose testing and urinalysis (dip urine).

clue 1, noun (oh)

[Date: 1500-1600; Origin: clew 'ball of string' (11-19 centuries), from Old English cliewen; from the use of a ball of string for finding the way out of a network of passages]
an object or piece of information that helps someone solve a crime or mystery
::Police have found a vital clue (=a very important clue) .
clue to/about/as to
::We now have an important clue as to the time of the murder.
::Archaeological evidence will provide clues about what the building was used for.
clue in
::This information is a valuable clue in our hunt for the bombers.
::a desperate search for clues
information that helps you understand the reasons why something happens
clue to/about/as to
::Childhood experiences may provide a clue as to why some adults develop Eating Disorders.
a piece of information that helps you solve a crossword puzzle, answer a question etc
::I'll give you a clue , Kevin, it's a kind of bird.
not have a clue (where/why/how etc)
informal a) to not have any idea about the answer to a question, how to do something, what a situation is etc
::'Do you know how to switch this thing off?' 'I haven't a clue.'
::Until I arrived here, I hadn't got a clue what I was going to say to her.
b) to be very stupid, or very bad at a particular activity
::Don't let Mike cook you dinner; he hasn't got a clue.
::I haven't a clue how to talk to girls.
not have a clue (where/why/how etc) about
::No point asking Jill - she hasn't got a clue about maths.

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