-some

CIDE DICTIONARY

-some,  

 A combining form or suffix from Gr. sw^ma (gen. sw`matos) the body; as in merosome, a body segment; cephalosome, etc.  [1913 Webster]

-some, a. [AS. -sum; akin to G. & OHG. -sam, Icel. samr, Goth. lustusams longed for. See Same, a., and cf. Some, a.].

 An adjective suffix having primarily the sense of like or same, and indicating a considerable degree of the thing or quality denoted in the first part of the compound; as in mettlesome, full of mettle or spirit; gladsome, full of gladness; winsome, blithesome, etc.  [1913 Webster]

OXFORD DICTIONARY

-some, suffix forming adjectives meaning:
1 adapted to; productive of (cuddlesome; fearsome).
2 characterized by being (fulsome; lithesome).
3 apt to (tiresome; meddlesome).

-some, suffix forming nouns from numerals, meaning 'a group of (so many)' (foursome).

-some, comb. form denoting a portion of a body, esp. of a cell (chromosome; ribosome).

Etymology

Gk soma body