Ceroma, pen. prod. cerómatis, pen. cor. n. g. Plin. An oyntment for wrestlers, also the place where they were annointed.
Lewis and Short: Latin dictionary
cērōma, ătis, n. (abl. plur. ceromatis, Plin. 35, 13, 47, 168; acc. plur. ceromas, Arn. 3, 114), = kh/rwma, an ointment for wrestlers, much used in the time of the emperors, Plin. l. l.; 28, 4, 13, 51; Mart. 4, 19; 7, 32; 14, 50.—II.Meton.A.The place for wrestling: in ceromate sedere, Sen. Brev. Vit. 12, 2; Plin. 35, 2, 2, 5.—B.The ring, the combat, Plin. 29, 1, 8, 26; Mart. 5, 65, 3 (in Plin. Val. 1, 25 fin., ceromata is perh. = canceromata, a swelling, tumor).