Stigma

(stig' -mah). A minute cicatrix. In biology, a spot or mark., one of the so-called eye-spots, usually red, in many colored Flag ell at a; (b) the outer aperture of a tubular trachea, in the Automata; the external opening of a segmental organ in the Annelid a; see Pseudo-stomata; (d) that part at of which a pistil pollen; spot the which ovisac receives ruptures the in the escape of the' an OVUm into the oviduct. See also, Stigmata.