You know what it looks like… but what is it called?
TAKE THE QUIZ“aclinic”
The following 2 entries include the term aclinic.
aclinic line
noun: an imaginary line on the earth's surface roughly parallel to the geographical equator and passing through those points where a magnetic needle if suspended freely has no dip or inclination and assumes a horizontal position compare agonic line, isoclinic line
put on a clinic
idiom: to perform or play extremely well
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Merriam-Webster unabridged