sphinx /ˈsfɪŋks/noun 5verb 4forms 6 noun5 •A creature with the head of a person and the body of an animal, commonly a lion.[W]hatsoe'er of strange / Sculptured on alabaster obelisk, / Or jasper tomb, or mutilated sphynx, / Dark Aethiopia in her desert hills. / Conceals. — 1815 •(figurative) A person who keeps their thoughts and intentions secret; an enigmatic or impassive person. •A sphinx moth. •(old-fashioned) A mandrill (Mandrillus sphinx), formerly classified as a baboon, and called sphinx baboon. •(euphemistic, rare) A sphincter.Constance said boastfully, ‘My sphinxes are strong and in good repair. I order you to come.’ — 1982 verb4 •To adopt the posture of the Sphinx.A hot lion with a very bloated stomach … will adopt either a sphinxed or a squatting posture which takes some of the weight off its belly.Several animals maintained either a crouched … or a sphinxing posture (abdomen on the floor) •To be inscrutable, often through silence.The sphinxèd riddle of the Universe, Nature's unsolved enigma, who may prove? — 1900 •To behave in a manner characteristic of the Sphinx. •To decorate with sphinxes.a marble sphinxed chimney-piece formssphinxed · sphinxing · sphinxes · Sphinges · Sphinxes · sphinges