Middle English blosme, from Old English blōstm, blōstma, from Proto-Germanic *blōstama (compare West Frisian blossem, Dutch bloesem), enlargement of *blōstaz (compare German Blust), from Proto-Indo-European *bʰleh₃-s- ‘bloom, flower’ (compare Latin flōs ‘flower’, Flōra ‘goddess of plants’, Albanian bleron (“to blossom, thrive”) ), from Proto-Indo-European *bʰel- ‘to thrive, bloom’. More at blow.
Alternative forms 
- blasom (Jamaican English)
blossom (plural blossoms)
- A flower, especially indicative of fruit as seen on a fruit tree etc.; taken collectively as the mass of such flowers.
- The blossom has come early this year.
- The state or season of producing such flowers.
- The orchard is in blossom.
Derived terms 
- (intransitive) To have or open into blossoms; to bloom.
- (intransitive) To begin to thrive or flourish.
- (have or open into blossoms): bloom, come into bloom, come into blossom, flower
- (begin to thrive or flourish): bloom, flourish, grow, prosper, thrive