To give an untrue testimony; to lie despite one's oath e.g. in court.

(linguistics, uncommon) A word in a language bearing a deceptive resemblance to a word in another language, and at least one meaning in common, but not all.

plural of false killer whale

A dolphin of species Pseudorca crassidens, the sole species of genus Pseudorca and one of the larger dolphin species.

plural of false potato beetle

Leptinotarsa juncta, a beetle found primarily in the Mid-Atlantic and southeastern regions of the United States.

A fungal disease of barley caused by Ustilago avenae.

To betray someone; to be disloyal to someone.

Maianthemum bifolium, the May lily, native from western Europe east to Siberia, China, and Japan

Baptisia australis, native to central and eastern North America.