1) Dental deposits 2) Dental scrapings 3) Kidney stones 4) Math systems 
• (n. pl.) See Calculus. • (pl. ) of Calculus
An abnormal concretion occurring within the animal body and usually composed of mineral salts. ... (12 Dec 1998) ... 
Cal'cu·li noun plural See Calculus . 
Type: Term Pronunciation: kal′kyū-lī Definitions: 1. Plural of calculus.
Calculi: The plural of calculus. (Calculi is the proper Latin plural. The alternate English plural is calculuses.)
Calculi are stones or solid lumps such as gallstones.
An abnormal concretion occurring within the animal body and usually composed of mineral salts.
(Latin) Roman checkers; this is the familiar game of 'five in a row,' which was played on the same boards as the Roman game latrunculi; calculi is the Latin word for 'stones' (or 'pebbles' or 'counters'); the Romans referred to this game as ludus calculorum, 'the game of stones,' but the references are general and unclear.
Solid lumps or stones which for in the body, e.g., gallstones.
Stones in the kidney, urinary bladder or occasionally gall bladder.
Describing a variety of stones that are found in the urinary system. These include kidney and bladder stones.