1153. इस् is. With the suffix is is formed a small number (about a dozen) of nouns.
a. They are in part nouns of action, but most are used concretely. The radical syllable has the guṇa-strengthening, and the accent is on the suffix (except in jyótis light, vyáthis, and ā́mis, raw meat). Examples are: arcís, rocís, and çocís light, chadís or chardís cover, barhís straw, vartís track, sarpís butter, havís oblation, dyotis light, and kravís raw flesh. Avis-, pā́this, bhrājis-, and máhis- are isolated variants of stems in as; and túvis-, çucis-, and surabhis- appear inorganically for tuvi etc. in a few compounds or derivatives.
1154. उस् us. With this suffix are made a few words, of various meaning, root-form, and accent.
a. They are words signifying both action and agent. A few have both meanings, without difference of accent: thus, tápus heat and hot; árus wound and sore; cákṣus brightness and seeing, eye; vápus wonderful and wonder. The nouns are mostly neuter, and accented on the root-syllable: thus, ā́yus, tárus, púrus, múhus (? only adverbial), míthus (do.), yájus, çā́sus; exceptions are: in regard to accent, janús birth; in regard to gender, mánus man, and náhus, proper name. Of adjectives, are accented on the ending jayús, vanús, and dakṣús burning (which appears to attach itself to the aorist-stem).
1155. इ i. With this suffix are formed a large body of derivatives, of all genders: adjectives and masculine agent-nouns, feminine abstracts, and a few neuters. They show a various form of the root: strong, weak, and reduplicated. Their accent is also various. Many of them have meanings much specialized; and many (including most of the neuters) are hardly to be connected with any root elsewhere demonstrable.
1. a. The feminine action-nouns are of very various form: thus, with weak root-form, rúci brightness, tvíṣi sheen; kṛṣí ploughing, nṛtí dance; — with guṇa-strengthening (where possible), rópi pain, çocí heat, vaní and saní gain; — with vṛddhi-strengthening, grā́hi seizure, dhrā́ji course, ājí race; from √duṣ comes dū́ṣi (compare dūṣayati, 1042 b). The variety of accent, which seems reducible to no rule, is illustrated by the examples given. The few infinitively used words of this formation (above, 975 b) have a weak root-form, with accent on the ending.
2. b. The adjectives and masculine agent-nouns exhibit the same variety. Thus:
c. With unstrengthened root: çúci bright, bhṛ́mi lively (√bhram), gṛ́bhi container.
