In commercial and everyday use, the term weight is usually used to mean mass, and the verb to weigh means to determine the mass of or to have a mass of. Used in this sense, the proper SI unit is the kilogram (kg).
For other uses, see Aphid (disambiguation). Aphids, also known as plant lice and in Britain and the Commonwealth as greenflies, blackflies, or whiteflies (not to be confused with jumping plant lice or true whiteflies), are small sap-sucking insects, and members of the superfamily Aphidoidea.
Meaning: Any of various small plant-sucking insects. Classified under: Nouns denoting animals. Hypernyms (aphid is a kind of...): louse; plant louse (any of several small insects especially aphids that feed by sucking the juices from plants) Hyponyms (each of the following is a kind of aphid): Aphis pomi; apple aphid; green apple aphid (bright green aphid; feeds on and causes curling of apple leaves) Aphis fabae; bean aphid; blackfly (blackish aphid that infests e.g. beans and sugar beets)