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Adjective: protrusive  prow'troo-siv [N. Amer], pru'troo-siv [Brit]
  1. Thrusting outward
    "This is a puzzling situation, since in order to move about cells must also be capable of generating protrusive forces"

See also: beetle, beetling, bellied, bellying, bulbous, bulging, bulgy, convex, jutting, obtrusive, overshot, projected, projecting, protruding, protuberant, relieved, starting, sticking, sticking out, underhung, undershot, underslung, ventricose, ventricous

Antonym: intrusive