1) sweet smelling, garden mint
1a) a kind of small odoriferous herb, with which the Jews used to scatter on the floors of their houses and synagogues
Part of Speech: noun neuter
Neuter of a compound of the same as G2234 and G3744; a sweet scented plant, that is, mint: - mint.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ἡδύοσμον; click on the second column to search for that grammatical form of the root ἡδύοσμον; click on the third column to search for that word and grammatical form; click on the total to search for the root ἡδύοσμον.