(n) headphone
(n) headboard
(n) head voice
(n) headlight
(P)
(n) headline
(n) headlamp
(n) head-room
(n) headrest (esp. on a car seat)
(n) headlock
(n) headwork
(n) (comp) head switching
(n) heterosis
(n) heterodyne
(n) heterozygote
(n) heavy metal
(n) Hebraism
(P)
(n) hemstitch
(n) hemoglobin
haemoglobin
(P)
(n) hemocyanin
(n) hemosiderin
(n) heliox
gas mixture of helium and oxygen
often hypoxic gas mix used by divers
medical gas used for its low density and easy breathing
(n) helical gear
(n) helical gear
(n) helicopter
(P)
(n,adj-no) herringbone
(n,adj-no) herringbone
(P)
(n) health club
(P)
(n) health food
(n) (obsc) helper cell
helper T cell
(n) hellfire