ctenoid

As nouns the difference between cycloid and ctenoid

is that cycloid is (geometry) the locus of a point on the circumference of a circle that rolls without slipping on a fixed straight line while ctenoid is a ctenoidean.

As adjectives the difference between cycloid and ctenoid

is that cycloid is resembling a circle; cycloidal while ctenoid is having a toothed margin, usually fish scales.

As nouns the difference between terms and ctenoid

is that terms is while ctenoid is a ctenoidean.

As an adjective ctenoid is

having a toothed margin, usually fish scales.

As nouns the difference between catenoid and ctenoid

is that catenoid is (geometry) a three-dimensional surface formed by rotation of a catenary while ctenoid is a ctenoidean.

As an adjective ctenoid is

having a toothed margin, usually fish scales.

As nouns the difference between ctenoid and ctenid

is that ctenoid is a ctenoidean while ctenid is (zoology) any member of the ctenidae.

As an adjective ctenoid

is having a toothed margin, usually fish scales.

As adjectives the difference between placoid and ctenoid

is that placoid is platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids while ctenoid is having a toothed margin, usually fish scales.

As nouns the difference between placoid and ctenoid

is that placoid is any fish having placoid scales, such as the sharks while ctenoid is a ctenoidean.