āpa
Āpa,& Āpo (nt.) [Vedic ap & āp,f. sg. apā,pl. āpaḥ,later Sk. also āpaḥ nt. -- Idg. *ap & *ab,primarily to Lith. ùpé water,Old Prussian ape river,Gr. *)lpi/a N. of the Peloponnesus; further (as *ab) to Lat. amnis river,Sk. abda cloud,& perhaps ambu water] water; philosophically t. t. for cohesion,representative of one of the 4 great elements (cp. mahābhūta),viz. paṭhavī,āpo,tejo,vāyo:see Cpd. 268 & Dhs.trsl. 201,also below °dhātu. ‹-› D.II,259; M.I,327; S.II,103; III,54,207; A.IV,312,375; Sn.307,391 (°ṁ),392 (Loc. āpe),437 (id.); J.IV,8 (paṭhavi-āpa-teja°); Dhs.652; Miln.363 (Gen. āpassa,with paṭhavī etc.); Sdhp.100.
--kasiṇa the water-device,i. e. meditation by (the element of) water (cp. Mystic 75 n.) D.III,268; J.I,313; Dhs.203; Vism.170; DhA I 312; III,214. --dhātu the fluid element,the essential element in water,i. e element of cohesion (see Cpd. 155 n. 2; Mystic 9 n. 2; Dhs.trsl. 201,242) D.III,228,247; M.I,187,422:Dhs.652; Nett 74. See also dhātu. --rasa the taste of water A.I,32; SnA 6. --sama resembling water M.I,423. (Page 101)