aphis

noun, plural a·phi·des [ey-fi-deez, af-i-] /ˈeɪ fɪˌdiz, ˈæf ɪ-/.

1. an aphid, especially of the genus Aphis.

1. Animal and Plant Health Inspection Service.

noun plural aphides (ˈeɪfɪˌdiːz)

1. any of various aphids constituting the genus Aphis, such as the blackfly
2. any other aphid