meatal cleft (ARTHRO: Insecta) A slit or line on the trumpet of some mosquito pupae extending into the meatus from the spiracular opening, facilitating enlargement of the opening at the surface of the water.
meatus n. [L. metus, passage] A channel or duct.
mechanical isolation Reproductive isolation due to mechanical incompatibility of male and female genitalia.
mechanoreceptor n. [Gr. mechane, contrivance; L. recipere, to receive] Specialized structures that perceive any mechanical distortion of the body, i.e., touch, vibrations, altitude and gravity.
meconida n.pl.; sing. -ium [Gr. mekon, poppy] 1. (ARTHRO: Insecta) Waste products of pupal metabolism that are discharged shortly after adult emergence. 2. (CNID: Hydrozoa) Medusoid gonophores, sessile or pedicellate, which upon emergence from the gonangium act as external brood sacs. meconium n.
media n. [L. medius, middle] 1. The middle structure. 2. (ARTHRO: Insecta) The longitudinal vein between the cubitus and the radius of the wing. medial a.
mediad adv. [L. medius, middle; ad, toward] Toward the median plane or line; mesad; admedial.
medial cross vein (ARTHRO: Insecta) A cross vein connecting two branches of the media of the wing.
medial-cubital cross vein (ARTHRO: Insecta) A cross vein of an insect wing between the posterior medial vein and the anterior cubital vein.
median a. [L. medius, middle] In the middle; along the midline of the body; middle variate when variates are arranged in order of magnitude.
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