the or writing end of a , especially a small, tapering, metallic device having a split tip for drawing up ink and for writing; nib.
the tip or of a ball-point or other .
penicillinase pen·i·cil·li·nase (pěn’ĭ-sĭl’ĭ-nās’) n.
[pen-uh-sil-in] /ˌpɛn əˈsɪl ɪn/ noun, Pharmacology. 1. any of several antibiotics of low toxicity, produced naturally by molds of the genus Penicillium and also semisynthetically, having a bactericidal action on many susceptible Gram-positive or Gram-negative cocci and bacilli, some also being effective against certain spirochetes. /ˌpɛnɪˈsɪlɪn/ noun 1. any of a group of antibiotics with […]
[pen] /pɛn/ noun 1. any of various instruments for writing or drawing with ink or a similar substance. 2. a detachable metal penpoint, filled by dipping or with a quill; nib. 3. such a penpoint with its penholder. 4. fountain pen. 5. ball-point pen. 6. the pen as the instrument of writing or authorship: The […]
/ˈpɛnrəʊz/ noun 1. Sir Roger. born 1931, British mathematician and theoretical physicist, noted for his investigation of black holes Penrose (pěn’rōz’) British mathematical astronomer and physicist who worked with Stephen Hawking to explain the physics of black hole formation. He is also known for his theories on artificial intelligence.