Hollyhock, hol′i-hok, n. a kind of mallow, brought into Europe from the Holy Land—(Bacon) Holl′y-oak. [M. E. holihocholi, holy, and A.S. hoc, mallows—Celtic, cf. W. hocys.]

Holm, hōlm, or hōm, n. a river-islet: rich flat land beside a river. [A.S. holm, orig. a mound; Ger. holm, &c.]

Holm, hōlm, or hōm, n. (Spens.) holly.—n. Holm′-oak, the ilex or evergreen oak, so called from some resemblance to the holly. [Holm- is a corr. of holin, the M. E. form of holly, which see.]

Holoblastic, hol-o-blas′tik, adj. undergoing segmentation throughout the entire mass, as the ova of mammals.

Holocaust, hol′o-kawst, n. a burnt sacrifice, in which the whole of the victim was consumed. [L.,—Gr. holokaustonholos, whole, kaustos, burnt.]

Holocryptic, hol-o-krip′tik, adj. concealing completely, undecipherable.

Holograph, hol′o-graf, n. a document wholly written by the person from whom it proceeds (also used as adj.).—adj. Holograph′ic. [Gr. holos, whole, graphein, to write.]

Holohedrism, hol-o-hē′drizm, n. (math.) the property of having the full number of symmetrically arranged planes crystallographically possible.—adj. Holohē′dral.—n. Holohē′dron, a form possessing this property. [Gr. holos, whole, hedra, base.]

Holometabolic, hol-o-met-a-bol′ik, adj. undergoing complete metamorphosis, as an insect—opp. of Ametabolic.

Holometer, hol-om′et-ėr, n. an instrument for taking all kinds of measures. [Gr. holos, whole, metron, measure.]