What does denticle mean?
A denticle is a small tooth or tooth-like projection. The word appears chiefly in scientific writing: biologists use it for the tiny tooth-shaped scales (dermal denticles) that cover the skin of sharks and rays, paleontologists use it for small cusps on fossil teeth, and engineers may apply it to fine points along a serrated blade or gear edge. Because denticles usually occur in large numbers rather than singly, the plural form dominates real usage. The word carries a precise, clinical tone and would sound out of place in casual conversation, where simpler terms like 'spike' or 'point' serve instead. Its root, the Latin dens meaning tooth, links it to familiar words like dental and dentist, making its meaning easy to remember. Denticle is valuable precisely because no common English word captures the idea so economically: a single syllable-rich noun that says 'a very small tooth' with scientific exactness.
nounA small tooth or tooth-like projection, especially one on a serrated edge or on the skin of a shark.
- A small tooth or tooth-like projection on a body part, especially the dermal denticles covering the skin of sharks and rays.
- A small pointed projection on a serrated or toothed edge, such as on a tool, gear, or leaf margin.
"The shark's skin is covered in thousands of tiny denticles that reduce drag as it swims."
"Under the microscope, each denticle on the shark's skin revealed a crown of enamel over a pulp cavity."
"The saw's blade was worn smooth, its once-sharp denticles ground away by years of cutting."
The plural is the usual form in practice, as denticles occur in groups, rows, or continuous coverings.
"The fossil record preserves denticles from ancient sharks long after their skeletons have dissolved."
A shark's skin is literally made of teeth — millions of microscopic denticles — which is why it feels like sandpaper if you rub it the wrong way.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of denticle
Denticle derives from the Latin denticulus, a diminutive of dens, meaning 'little tooth'. It entered English via Latin or post-classical scientific usage around the early seventeenth century. The same Latin root gives us a wide family of tooth-related words, including dental, dentist, dentition, trident, and indent. The adjective denticulate ('finely toothed') shares the identical source and remains standard terminology in botany and zoology.
Related word forms
How denticle is actually used
Denticle is a technical term, used mainly in zoology, paleontology, anatomy, and engineering. In everyday speech it is rare; speakers would more likely say 'small tooth' or 'tiny spike'. The plural 'denticles' is far more common than the singular, since these structures typically occur in rows or coverings. The adjective form is 'denticulate' (having small teeth).
Easily confused with denticle
A dentil is a small rectangular block in a row under the cornice of a classical building, whereas a denticle is any small tooth-like projection, most often biological.
A denture is a removable plate of artificial teeth, while a denticle is a single tiny natural tooth-like structure.