1
: either of the two parallels of terrestrial latitude at a distance of about 23¹/₂ degrees north or south of the equator where the sun is directly overhead when it reaches its most northerly or southerly point in the sky compare tropic of cancer, tropic of capricorn
2
: of, relating to, or occurring in the tropics
tro·pic
ˈtrō-pik
1
: of, relating to, or characteristic of tropism or of a tropism
2
of a hormone
: influencing the activity of a specified gland
1
: turning, changing, or tending to turn or change in a (specified) manner or in response to a (specified) stimulus
geotropic
2
: attracted to or acting upon (something specified)
neurotropic
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Merriam-Webster unabridged
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