عس

عُسٌّ ذ A [ drinking-cup or bowl, of the kind called ] قَدَح: (TA:) or a large قَدَح, (S, A, Mgh, O, L, Msb, K,) from which two or three or more [ men ] may satisfy their thirst; (L, TA;) larger than the غُمَر; (L, voce رِفْدٌ:) though this is greater in height; (TA;) and larger than the قَعْب; (IAar, in TA, voce قَعْبٌ;) but not so large as the رِفْد: (S, O:) pl. عِسَاسٌ (S, A, Mgh, O, Msb, K) and عِسَسَةٌ (TA) and [pl. of pauc.] أَعْسَاسٌ. (IAth, Msb.) ― -b2- Hence, one says, هُوَ لَكَ عَلَى ظَهْرِ العُسِّ, meaning (assumed tropical:) It is apparent, manifest, or conspicuous, to thee. (O in art. ظهر.) -A2- And The penis. (O, K.)