A bone situated straight away beneath the sphenoid when you look at the root of the head in many vertebrates.
an extended azygous dagger-shaped membrane-bone extending in midline lengthwise under the root of the head in Sauropsida, along the course of the sphenoid bone right. It forms area of the so-called rostrum or beak of the head.
A median unpaired bone tissue underlying the skull of amphibians and fishes, articulating aided by the vomer right in front sufficient reason for a number of bones behind.
This does not seem to be equivalent bone tissue as that similar title into the higher vertebrates, and it has already been ho-mologized by some writers with all the true vomer of the latter. See def. 1, and cuts under Lepidosiren and Anura.