-so·ma \ˈsōmə\noun combining form Etymology: New Latin -somat-, -soma, from Greek sōmat-, sōma body; akin to Latin tumēre to swell — more at thumb 1.: one having (such) a body — in generic names in zoology < Dolichosoma > < Loxosoma > and botany < Crossosoma > 2.plural-somas\-məz\or-soma·ta\-məd.ə, -ətə\: body < antinosoma > < hydrosoma > : region or portion of a body < mesosoma > < prosoma >