Mesne, mēn, adj. intermediate: applied to a writ issued between the beginning and end of a suit.—Mesne lord, one who held land of a superior, but had granted part of it to another person. [Norm. Fr. mesne, middle.]

Mesoblast, mes′o-blast, n. the middle one of the three germinal layers of any metazoic embryo between the epiblast and the hypoblast: the mesoderm.—adj. Mesoblas′tic.

Mesocarp, mes′o-kärp, n. (bot.) the middle one of the three layers of a seed-vessel.

Mesocephalic, mes-ō-sē-fal′ik, adj. of medium breadth or capacity—of the skull—also Mesoceph′alous.—ns. Mesoceph′alism, Mesoceph′aly.

Mesoderm, mes′o-derm, n. Same as Mesoblast.

Mesodic, me-sod′ik, adj. (pros.) pertaining to a system of different form intervening between a strophe and its antistrophe.

Mesogastric, mes-o-gas′trik, adj. of or belonging to the middle of the stomach: denoting the membrane which sustains the stomach.

Mesophlœum, mes-ō-flē′um, n. (bot.) the middle or green layer of bark.

Mesothorax, mes-o-thō′raks, n. the middle one of the three segments of an insect's thorax.—adj. Mesothorac′ic.

Mesozoic, mes-o-zō′ik, adj. of the Secondary geological period, including the Triassic, Jurassic, and Cretaceous systems. [Gr. mesos, middle, zōē, life.]