ὑπόρριζος
From LSJ
ἀσκέειν, περὶ τὰ νουσήματα, δύο, ὠφελέειν, ἢ μὴ βλάπτειν → strive, with regard to diseases, for two things — to do good, or to do no harm | as to diseases, make a habit of two things — to help, or at least, to do no harm
English (LSJ)
ον, (πίζα)
A under or below the root (sc. navel), Arist.HA 493a18. II with piece of root attached, Thphr.HP2.1.3, CP1.2.2. III Subst. ὑπόρριζον, τό, secondary root, Dsc.1.11.