- hedysarum coronarium
- helmet orchid
- Himantoglossum hircinum
- Hexalectris spicata
- Hexalectris warnockii
- Hordeum
- Hexalectris
- Holcus
- Himantoglossum
- Hydrocharis
- Heteranthera
- hatter
- hatmaker
- household linen
- Hittite
- home ground
- hapsburg
- halter
- hatching
- harquebus
- hatchel
- heckle
- hemagglutination
- hematal
- hemagglutinate
- heme
- hemal
- hematin
- hemangioma
- hemal arch
- hematite
- hematocoele
- hematic
- hemic
- horn fly
- hematocele
- hematochezia
- hematocolpos
- hematocolpometra
- hematocytopenia
- hematuria
- hemopoiesis
- hematopoiesis
- hematocyturia
- hemogenesis
- hematogenesis
- hematogenic
- hematopoietic
- hematologic
- hematohiston