Gain- (A.S.), against, as gainsay. [A.S. gegn. See Against in Dict.]
Hemi- (Gr.), half, as hemisphere—shortened to me- in megrim. [Gr.; cog. with L. semi-, Sans. sāmi-.]
Hetero- (Gr.), other, as heterodoxy. [Gr. heteros, other.]
Holo- (Gr.), entire, as holograph. [Gr. holos, entire.]
Homo- (Gr.), same—lengthened to Homœo-, as homœopathy. [Gr. homos, same.]
Hyper- (Gr.), over, above, beyond, as hyperborean, hypercritical. [Cog. with super- and over-.]
Hypo-, Hyph-, Hyp-, (Gr.), under, as hypotenuse, hyphen, hypallage. [Cog. with L. sub-, Goth. uf, Sans. upa.]
I-, in ignoble. See In- (1), negative.
I-, Y-, as in I-wis, yclept, hand-y-work. This prefix appears as a- in aware, as c- in clutch, and as e- in enough. [A.S. ge-, sign of the past participle passive.]
Il-, as in illude. See In- (2).