'Sow bug' definitions:

Definition of 'sow bug'

noun

Terrestrial isopod having an oval segmented body (a shape like a sow)

From: GCIDE

Sow \Sow\, n. [OE. sowe, suwe, AS. sugu, akin to s[=u], D. zog, zeug, OHG. s[=u], G. sau, Icel. s[=y]r, Dan. so, Sw. sugga, so, L. sus. Gr. "y^s, sy^s, Zend. hu boar; probably from the root seen in Skr. s[=u] to beget, to bear; the animal being named in allusion to its fecundity. [root]294. Cf. Hyena, Soil to stain, Son, Swine.]
1. (Zool.) The female of swine, or of the hog kind. [1913 Webster]
2. (Zool.) A sow bug. [1913 Webster]
3. (Metal.) (a) A channel or runner which receives the rows of molds in the pig bed. (b) The bar of metal which remains in such a runner. (c) A mass of solidified metal in a furnace hearth; a salamander. [1913 Webster]
4. (Mil.) A kind of covered shed, formerly used by besiegers in filling up and passing the ditch of a besieged place, sapping and mining the wall, or the like. --Craig. [1913 Webster]
Sow bread. (Bot.) See Cyclamen.
Sow bug, or Sowbug (Zool.), any one of numerous species of terrestrial Isopoda belonging to Oniscus, Porcellio, and allied genera of the family Oniscidae. They feed chiefly on decaying vegetable substances.
Sow thistle [AS. sugepistel] (Bot.), a composite plant (Sonchus oleraceus) said to be eaten by swine and some other animals. [1913 Webster]