12-letter words containing o, s, t, i
- chocolatiers — Plural form of chocolatier.
- choirmasters — Plural form of choirmaster.
- chondrostian — relating to the class Chondrostei of fish with fin rays
- choreologist — a person who is expert in choreology
- christophany — an appearance or emergence of Christ following his crucifixion
- christophene — chayote.
- chromaticism — the use of chromatic tones.
- chromatopsia — an irregularity in the ability to see colours properly
- chronologist — a person versed in chronology.
- chymotrypsin — a powerful proteolytic enzyme secreted from the pancreas in the form of chymotrypsinogen, being converted to the active form by trypsin
- cinque ports — an association of ports on the SE coast of England, originally consisting of Hastings, Romney, Hythe, Dover, and Sandwich, which from late Anglo-Saxon times provided ships for the king's service in return for the profits of justice in their courts. The Cinque Ports declined with the growth of other ports and surrendered their charters in 1685
- circuitously — roundabout; not direct: a circuitous route; a circuitous argument.
- circulations — Plural form of circulation.
- cirrostratus — a uniform layer of cloud above about 6000 metres (20 000 feet)
- civilisation — Alternative spelling of civilization.
- claims ratio — The claims ratio is the percentage of claims costs incurred in relation to the premiums earned.
- clairvoyants — Plural form of clairvoyant.
- class action — A class action is a legal case brought by a group of people rather than an individual.
- claustration — the act of confining to a small space (usually a cloister)
- cleistogamic — Alternative form of cleistogamous.
- cleptobiosis — an ecological relationship in which members of one species, as of ants, steal food from another.
- clerestories — Plural form of clerestory.
- clerofascist — A cleric supporting fascism or advocating a synthesis of religion and fascism.
- clinozoisite — a monoclinic mineral, hydrous calcium aluminum silicate, a variety of epidote, dimorphous with zoisite.
- clintonomics — (used with a singular verb) the economic policies set forth by President Bill Clinton.
- cloisterless — a covered walk, especially in a religious institution, having an open arcade or colonnade usually opening onto a courtyard.
- close stitch — buttonhole stitch.
- close-fisted — very careful with money; mean
- closefitting — fitting tightly, esp. in such a way as to show the contours of the body
- closing date — The closing date for a competition or offer is the final date by which entries or applications must be received.
- closing time — Closing time is the time when something such as a shop, library, or pub closes and people have to leave.
- clothes-line — a strong, narrow rope, cord, wire, etc., usually stretched between two poles, posts, or buildings, on which clean laundry is hung to dry.
- clotheslined — Simple past tense and past participle of clothesline.
- clotheslines — Plural form of clothesline.
- clovis point — flint projectile dating from the 10th millennium bc
- co-extrusion — simultaneous extrusion of two or more different yet compatible metals or plastics through the same die.
- co-president — a person who shares the highest position in an organization with another person
- coalitionism — the principle of governing by coalition
- coalitionist — An advocate of coalition or a partner in a coalition.
- coast salish — (in Canada) a division of the peoples who speak Salish languages
- cocaine bust — an arrest for the possession of cocaine
- coccidiostat — a drug used to treat coccidiosis
- coding sheet — a form on which a program is written
- coefficients — Plural form of coefficient.
- coenesthesia — general awareness of one's own body
- cognoscitive — having the ability to know or discover: cognoscitive powers.
- cohesibility — the nature of being cohesible
- coleopterist — a person who studies the Coleoptera
- collectibles — capable of being collected.
- collectivise — Alternative spelling of collectivize.