[f. prec. vb. + -ER1.] One who or that which thaws; spec. in Mining, a device or apparatus for thawing frozen ground.
1630. R. Johnson’s Kingd. & Commw., 7. Even in that continuall neighbourhood of that great Thawer [i.e., the sun] have you hils perpetually covered with frost and snow.
1900. Pop. Sci. Monthly, Feb., 461. The introduction of mining machinery, such as … thawers … has given fresh impetus.
