Filiform

(filf -if-orm). Thread-like. F. Bougie. See Bougie. F. Papillae, the smallest and most numerous of the papillae of the tongue, occurring over its whole surface. F. Apparatus, in biology, the longitudinally striated, homogeneous, strongly refractive, cellulose cap, often found at the apex of each of the two cells (synergidiz) forming a part of the germinal apparatus or egg-apparatus of plants.