The Collaborative International Dictionary
Tomium
Tomium \To"mi*um\ (t[=o]"m[i^]*[u^]m), n.; pl. Tomia (t[=o]"m[i^]*[.a]) [NL., fr. Gr. te`mnein to cut.] (Zo["o]l.) The cutting edge of the bill of a bird.
Wiktionary
tomium
n. (context zoology English) The cutting edge of the bill of a bird.
Wikipedia
Tomium
The tomium is the sharp cutting edge of the beak of a bird or turtle. Sometimes the edge is serrated for tearing through flesh or seaweed (in the case of sea turtles). Snapping turtle tomia can be dangerous because their bites are swift and powerful.
Usage examples of "tomium".
Correlated with this peculiarity the maxilla usually has the tomia sinuated, and is generally concave, and smaller and narrower than the mandible, which is also concave to receive the palatal knob.