a, m. a rare word, the sense of which is somewhat doubtful, a delve (?); Manar þjálmi, the delve of Mono, i. e. the sea; hregg-þjálmi, the delve of the gale, i. e. the sky; þangs-þ., the delve of the sea-weed, i. e. the sea, the surf, Lex. Poët.: in prose the word occurs once,—hverja þjálma nær eðr firr Heinrekr egnir fyrir fætr Thome erkibiskupi, Thom. 361, where it seems to mean a caltrop or a pit-fall (?).