ctene / teen [ti:n]
ctene – n. – one of the ciliated swimming plates of a ctenophore (small phylum, consisting of widely distributed and at times very abundant marine hermaphroditic solitary animals that superficially resemble jellyfishes, and are usually more or less ellipsoidal with decided bi-radial symmetry and swim by means of eight meridional bands of transverse ciliated plates, each plate representing a row of large modified cilia)
teen – adj. & n. – short form of teenager, a person aged from 13 to 19 years inclusive