Abaxial definitions

ăb-ăk'sē-əl
Located away from or on the opposite side of the axis, as of an organ or organism.
adjective
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Away from or facing away from the axis.

The abaxial surface of a leaf.

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The definition of abaxial refers to a position on the opposite side of or away from the axis.

An example of abaxial is the lower part of a leaf that faces away from the plant's stem.

In biology, the dorsal or back fin of a fish is on the abaxial side from the belly.

adjective
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Located away from or on the opposite side of the axis, as of an organ or organism.
adjective
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(botany) On the side that is away from the axis or central line, usually on the underside; dorsal. [Mid 19th century.]
adjective
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(mathematics) A direction perpendicular to an axis or the coordinate that measures displacement in such a direction.
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Origin of abaxial

ab- (“away from”) +‎ axial (“axis”).