(geography) Either of the two parallels of the Earth located at the latitude of 66° 33′ 44″ N and 66° 33′ 44″ S.

(biology) non-motile single cilium

plural of primary cilium

(music) a chord progression with ascending fourths and/or descending fifths

plural of circle progression

(cryptography) a symmetric-key cipher in which plaintext digits are combined with a pseudorandom cipher digit stream

Synonym of sawdust trail

plural of ciliary muscle

plural of ciliary body

(anatomy) circumferential tissue inside the eye composed of the ciliary muscle and ciliary processes