Part of the mouth of an insect, especially the sucking mouthparts of a fly.
The lower central petal of a flower (especially an orchid), usually developed to be showy and attract pollinators.
A lower mouthpart of an insect that is formed by the second pair of maxillae united in the middle line.
The lip of a labiate corolla.
A liplike structure; especially one of the two pairs of folds of skin on either side of the vulva.
A liplike part of various invertebrates.
The lip against which pressured air is driven to produce sound in a recorder and in a pipe organ with flue pipes.