adjective
Definition: Relating to or resembling a small sap-sucking insect known as an aphid.
Example: The gardener noticed aphidian damage on the leaves of the plants.
noun
Definition: A type of small insect that belongs to the family Aphidoidea, commonly known as aphids, which are often found on plants and can be pests in gardens and agriculture.
Example: The gardener noticed that the aphidian population was increasing on the rose bushes.